11 best coolant sealant

Product description

K-Seal 8 fluid ounce bottle is effective to 20 quarts cooling capacity. Just shake, pour and go. It repairs leaks and cracks in radiator, head gasket, heater core, freeze plugs, water pump casing, cylinder heads and engine blocks.

• REPAIRS IN MINUTES: Formulated to permanently weld radiators, including hard plastic aluminum heads and blocks in old and new cars. The only car radiator and gasket sealant university tested to meet ASTM D3147. Save time/money. US Bestseller
• SEALS CRACKS AND STOPS LEAKS: A DIY alternative to costly repairs, our coolant leak fix permanently seals cracks and holes! It quickly repairs your leaking radiator, freeze plug, heater core and water pump casing with no adverse impact on efficiency.
• POUR AND GO: Our cooling system sealer is easy to use: just shake the bottle, add to your radiator/overflow and run the engine! Unlike some traditional products, it mixes with all types of antifreeze, absolutely no draining or flushing required.
• SCIENTIFICALLY TESTED: Safe and effective, our cracked block repair can seal leaks up to 1/32 of an inch! Once cured, the repair withstands the high pressure of the combustion chamber, all without failing or clogging the cooling system.
• CUSTOMER SUPPORT: If K-Seal engine coolant leak stop doesn’t seal, the system might be over-pressurized. Check the Technical Specification section of this page for extra instructions for a successful repair. Over 8 million bottles sold worldwide!

User questions & answers

Question:	can you mix this with barstop if you all ready put that in the radiator
Answer:	I did mix this with Irontite All Weather Seal. Did the K-seal first. Irontite a week later. Just to be sure. Since they both said it can remain in the system. Two weeks, still good.
Question:	Can you use this in a 2013 escape
Answer:	Unless specifically told to use no heating system sealants I have no reason I can think of you can't use it. I used some but sparingly until it got the job done. Its a little bottle but still have half left. It's been okay for about 6 months now.
Question:	Does it discolor the antifreeze? Thanks
Answer:	Unfortunately I can't say. I have a GM vehicle that uses the orangish color engine coolant and it and this product are so close in color it's hard to say if it would discolor the usual green-colored coolant found in non-GM vehicles. The other challenge is that I can only look at the coolant through an overflow reservoir and it's so dark when I look inside (I have to use an LED flashlight to see it adequately) that it would be hard to tell if there was any discoloration.
Question:	will this work for leakey gaskets
Answer:	This is "liquid glass" that dries rock hard and will seal your head gasket leak (its been used in farm equipment for over 75 years and is WELL proven to work, and it was discovered over a hundred years ago), but you MUST perform a simple test. Start your vehicle, let it idle for 45 minutes straight. If the temperature gauge does not indicate that your engine is overheating, then this product will most likely work. No overheating at an idle for 45 minutes MEANS that the head gasket leak is still small enough to be filled by this liquid glass. Shake the container for 30 seconds, put the liquid in your COOLANT system, drive for an hour (or other words, operate at normal temperature, especially if its an aluminum block with cast iron heads), and then let it sit for 24-48 hours (the longest time is better). This sitting time allows the liquid glass to harden completely through. If it overheats then, it most likely its a thermostat or water pump or lower radiator hose sucking shut under load (sometimes the upper one also) or radiator or radiator fan or leaking core plug or leaking coolant storage unit OR your ENGINE OIL is very low from leaking (completely different problem that has nothing to do with the coolant system, but much to do with the cooling of the engine also) or heat indicator gauge or it still could be a blown head gasket, because the hole is just too big for the sealant to seal it up OR the head gasket BLOWS in another area after you have sealed up the first hole with the coolant sealant you added (that's why you should add it three times three different bottles of liquid glass over three months as I will mention below, that way, if it does blow in another area you will most likely SEAL that area also). But buy this and try it even if your vehicle fails the 45 minute test after 10 minutes. Sometimes, it will still seal the leak, or at least slow it down. Also, you can add this once a month for three months, and maybe that will work also (this gives you a month to see how the car performs under various conditions, and for the reason I just mentioned above). If you need the car to last for just a short while (month to six months) this can be a quick fix to hold you over until you can sell the car (under buyer be where conditions) or get it to the shop when you have the money. $15 and a few minutes of your time OR the mechanic, you have to decide. Good luck. I'm a retired mechanic with two degrees in Diesel mechanics and I ran a shop for a year.... :)

Product features

Permanent Coolant Leak Repair with K-Seal

Coolant leaks don’t have to result in costly repair bills – simply add K-Seal to your coolant system for a quick and permanent fix. K-Seal is trusted by millions of customers worldwide, and the only coolant leak repair fluid carried by the AA, the UK’s largest roadside repair company.

K-Seal couldn’t be simpler to use. K-Seal’s unique formula will seek out holes and cracks, and permanently seal them, with no adverse impact on the efficiency of your engine cooling.

Coolant System Sealer

Once the crack or hole has been located, the microfibers instantly begin to mesh together within the gap, building a seal literally fiber by fiber to stop the coolant leaking through the gap.

The particles in our K-Seal products are very precisely designed to be large enough to repair holes up to 0.635mm in size but deliberately small enough to never block any passageways or tubes within the cooling system, including those inside the heater core and radiator.

Once the microfibers have sealed and fixed the leak, a combination of exposure to either the external atmosphere or the gases within the combustion chamber and the heat within the cooling system and engine causes the K-Seal formula to cure. This results in an extremely strong and permanent seal able to withstand even the high pressures from the combustion chamber. This is how K-Seal Ultimate is able to repair head gasket failures, even where the cooling system is being over-pressurized exhaust gases entering the system

Common Coolant Leaks

K-Seal can deal with all of these leaks and more, as long as they are identified as early as possible. It is easy to use – simply shake it and pour it into the coolant mixture and it will work automatically.

Product description

K-Seal 8 fluid ounce bottle is effective to 20 quarts cooling capacity. Just shake, pour and go. It repairs leaks and cracks in radiator, head gasket, heater core, freeze plugs, water pump casing, cylinder heads and engine blocks. For truck, tractor, industrial, RV and large capacity engines.

• REPAIRS IN MINUTES: Create a permanent weld within the entire coolant system, including on hard plastic radiators and aluminum heads and blocks in larger capacity engines, AG, RV etc. The only industrial coolant sealant university tested to meet ASTM D3147.
• SEALS CRACKS AND STOPS LEAKS: Avoid expensive downtime, our coolant stop leak will permanently seal cracks and holes! Quickly repair your head gasket, block, leaking radiator, freeze plug, heater core & water pump casing with no adverse impact on efficiency.
• POUR AND GO: Our cooling system sealer is easy to use just shake the bottle, add to your radiator/overflow and run the engine! Unlike some competitive products, it mixes with all types of antifreeze, no draining, flushing or pulling the thermostat required.
• SCIENTIFICALLY TESTED: Safe and effective, our Heavy Duty Coolant stop leak repair seals leaks up to 1/32 of an inch! Once cured, it withstands the high pressure of the combustion chamber, without failing or clogging the cooling system. US Bestseller
• CUSTOMER SUPPORT: If our engine coolant leak doesn’t seal your head gasket, the system might be over-pressurized. Check the Technical Specification section of this page for extra instructions for a successful repair. Over 8 million bottles sold. Save time/money

User questions & answers

Question:	Tried using alumaseal, which isn't working. will i need to flush the system before using the k-seal
Answer:	I used the HD Truck bottle on my 1998 GEO Tracker ( used 1/3 of the bottle ) of K-Seal and it worked. I have used so many to no avail. To answer your question, I must have @ least 3 to 4 other sealers in my colling system when I added K-Seal. It's been almost a year & no adverse effects having not flushed my radiator. Should I have flushed the radiator & the system? Yes, I should have.
Question:	Will this work with aluminum heads
Answer:	It works equally well with cast iron or aluminum. Great Stuff. Not a long-term solution, but it will buy you a lot of time.
Question:	how much do i need to pour in a diesel 1 ton cummins
Answer:	You need this one bottle for a Dodge 3500 hd. I have this one bottle in my HD Freightliner 330hp MBZ engine hauling freight (54,000 lbs cap) 6 days a week and it stopped my coolant leak in the engine bay and heater core with no blockage and no. My opinion, Many reviews say products dont work BECAUSE most people dont take care of their equipment and their vehicles are old, high mileage and no maintenance done. None of the add to a tank products are as good as replacing with new parts but thats expensive, we get it. This may or may not fix your problem but its a low cost gamble with a high probability of success. Dont listen to the negative reviews. If the problem comes back, your damage was too far gone and in need of replacement anyway.
Question:	Does it work on potentially warped heads
Answer:	Probably not, but read on, and learn about all coolant leak problems if you want and how effective this product is....This bottle is enough for up to 12 cylinder engines.This will work for any type of coolant leak, if the leak is small. This will work on head gasket leaks also, read this 3 minute read on what to do if its a head gasket leak. Also, for for your information - This is "liquid glass" that dries rock hard and will seal your head gasket leak (its been used in farm equipment for over 75 years and is WELL proven to work, and it was discovered over a hundred years ago), but you MUST perform a simple test. Okay, start your vehicle, let it idle for 45 minutes straight. If the temperature gauge does not indicate that your engine is overheating, then this product will most likely work. No overheating at an idle for 45 minutes MEANS that the head gasket leak is still small enough to be filled by this liquid glass. Shake the container for 30 seconds, put the liquid in your COOLANT system, drive for an hour (or other words, operate at normal temperature, especially if its an aluminum block with cast iron heads), and then let it sit for 24-48 hours (the longest time is better). This sitting time allows the liquid glass to harden completely through. If it overheats then, it most likely its a thermostat or water pump or heater core or lower radiator hose sucking shut under load (sometimes the upper one also) or radiator or radiator fan or leaking core plug or leaking coolant storage unit OR your ENGINE OIL is very low from leaking (completely different problem that has nothing to do with the coolant system, but much to do with the cooling of the engine also) or heat indicator gauge or it still could be a blown head gasket, because the hole is just too big for the sealant to seal it up OR the head gasket BLOWS in another area after you have sealed up the first hole with the coolant sealant you added (that's why you should add it three times three different bottles of liquid glass over three months as I will mention below, that way, if it does blow in another area you will most likely SEAL that area also). But buy this and try it even if your vehicle fails the 45 minute test after 10 minutes. Sometimes, it will still seal the leak, or at least slow it down. Also, you can add this once a month for three months, and maybe that will work also (this gives you a month to see how the car performs under various conditions, and for the reason I just mentioned above). If you need the car to last for just a short while (month to six months) this can be a quick fix to hold you over until you can sell the car (under buyer be where conditions) or get it to the shop when you have the money. $15 and a few minutes of your time OR the mechanic, you have to decide. Good luck. I'm a retired mechanic with two degrees in Diesel mechanics and I ran a shop for a year.... :)

Product features

Permanent Coolant Leak Repair with K-Seal

Coolant leaks don’t have to result in costly repair bills – simply add K-Seal to your coolant system for a quick and permanent fix. K-Seal is trusted by millions of customers worldwide, and the only coolant leak repair fluid carried by the AA, the UK’s largest roadside repair company.

K-Seal’s unique formula will seek out holes and cracks, and permanently seal them, with no adverse impact on the efficiency of your engine cooling.

Coolant System Sealer

Once the crack or hole has been located, the microfibers instantly begin to mesh together within the gap, building a seal literally fiber by fiber to stop the coolant leaking through the gap.

The particles in our K-Seal products are very precisely designed to be large enough to repair holes up to 0.635mm in size but deliberately small enough to never block any passageways or tubes within the cooling system, including those inside the heater core and radiator.

Once the microfibers have sealed and fixed the leak, a combination of exposure to either the external atmosphere or the gases within the combustion chamber and the heat within the cooling system and engine causes the K-Seal formula to cure. This results in an extremely strong and permanent seal able to withstand even the high pressures from the combustion chamber. K-Seal Ultimate is able to repair head gasket failures, even where the cooling system is being over-pressurised by exhaust gases entering the system.

Common Coolant Leaks

K-Seal can deal with all of these leaks and more, as long as they are identified as early as possible. It is easy to use – simply shake it and pour it into the coolant mixture and it will work automatically.

Product description

Bar's Leaks Liquid Aluminum Stop Leak seals radiator leaks. Seals freeze plug leaks. Repairs gasket leaks and heater core leaks. Lowers water temperature.

• Bar's Leaks Liquid Aluminum Stop Leak seals radiator leaks. Seals freeze plug leaks. Repairs gasket leaks and heater core leaks. Lowers water temperature.
• Seals radiator leaks
• Seals freeze plug leaks
• Repairs gasket leaks
• Special Shipping Information: This item cannot be returned and has additional shipping restrictions

User questions & answers

Question:	Do I need to flush the cooling system before using this product if I had used bar’s tablet? I am choosing between these two since the leak is small
Answer:	You do not have to flush the system, in fact you may flush it after to put in the Bars Leak and run for a couple hundred miles to make sure your leak is sealed.
Question:	will this work on the head also
Answer:	Try it...it's inexpensive. Whether it works depends on the specifics of your problem. I tried it on a 4 cylinder BMW with a new head and profile gasket and a slow leak. It worked great.
Question:	can it be used in a Tahoe plastic tank
Answer:	i used it in my volvo which has a plastic expansion tank and no problems. it won't fix big leaks but if you're losing just a little coolant over time and can't find the leak this is the stuff to use!
Question:	My radiator leaking from the seam. Slightly overheating. Will this seal at the seam
Answer:	It should,depending on how big the leak/crack is,the one on my semi truck was dripping big,half a gallon a day,I was worried bc that s a $2,000.00 repair,I bought it not expecting any results,since I had previously used Bars leak (the small silver bottle) and didn t work,so this was a prayer and a last hope, 5,000 mls later and not a leak,not extra coolant added,it is liquid aluminum,so it bonds to wherever the leak is and forms a sealing coat...I think of it as welding from the inside...I hope it works for you as it did for me,it really was an answer to prayer...I know I m a bit dramatic but it was.PS,try to follow recommended amount or as close as recommended,not much less and not much more,I used 2 bottles on a 11 gal radiator.God bless.

Product features

Frequently Asked Questions

Yes, Liquid Aluminum is specifically designed to be directly added to the cooling system without having to flush out the antifreeze. It also can be used in water alone. But if using in water, it is recommended that another bottle of Liquid Aluminum be added to the system once antifreeze is installed.

Will it work in the new extended life antifreeze?

Yes, Liquid Aluminum works with all types of coolant including yellow, orange, pink, red, blue and green silicate based and non-silicate based OAT/HOAT antifreeze and/or water.

How long does it take to see results?

We recommend you drive/idle the vehicle for 10 to 20 minutes. In most cases the leak will be sealed instantly, but others will require up to 20 minutes. If the leak is not sealed in 20 minutes, a second application may be required or mechanical repair may be needed.

Bar’s Leaks is more than just a stop-leak company

We are a team of enthusiasts and experts who create memorable experiences with each and every one of our customers. With nearly 70 years of experience in helping everyday automobile owners repair leaks, we have the track record of success and long history that demonstrates our commitment and passion to helping drivers of all experience levels. You’ll see that our passion shines through in everything we do.

Product description

Bar's Leaks Cooling System Repair.

• Stops cooling system leaks
• Compatible with all brands of anti-freeze including conventional green or blue and extended life red/orange or yellow (OAT/HOAT) coolant
• Premium carbon fiber formulation for extended protection

User questions & answers

Question:	Que cantidad de Cooling System Repair se pone al motor y cada cuanto tiempo
Answer:	Una botella a la vez y aproximadamente una vez cada 5000 millas. Gracias,
Question:	Has anyone us this on Diesel engine for combustion leaking into coolant
Answer:	I used it on a semi for a pump leak. It’s not a permanent fix. But it can get you a couple of days to get you home.
Question:	I have a leak in the bottom left of my radiator ... Not sure if its the radiator or the hose its kinda hard to tell. runs hot in traffic
Answer:	Hmmm... Hose leaks are hard to stop....... It's usually better to replace the hose.... If it is the radiator, this will more than likely work..... Are you running hot when the coolant is low? or are you running hot most of the time? This won't do anything to help a radiator that does not cool efficiently, the radiator would need to be replaced.
Question:	Will using this product do anything to tear up ur vehicle if ur not sure it has a leak
Answer:	Shouldn't, only flows through the closed cooling system. I had a freeze plug leaking, was too large of a leak for this to fix, noticed no adverse effects after replacing freeze plug.

Product features

Frequently Asked Questions

Yes, Cooling System Repair is specifically designed to be directly added to the cooling system without having to flush out the antifreeze as long as manufactures recommendations are followed. It also can be used in water alone. NOTE: Cooling systems that are dirty or partially clogged should be flushed before usage.

Do I need to drain my cooling system after using Cooling System Repair?

No, this product is designed to be left in the cooling system to protect from future leaks and overheating.

How long does it take to see results?

We recommend you drive/idle the vehicle for 15 minutes. In most cases the leak will be sealed instantly, but others will require up to 20 minutes. If the leak is not sealed in 20 minutes, a second application may be required or mechanical repair may be needed.

Bar’s Leaks is more than just a stop-leak company

We are a team of enthusiasts and experts who create memorable experiences with each and every one of our customers. With nearly 70 years of experience in helping everyday automobile owners repair leaks, we have the track record of success and long history that demonstrates our commitment and passion to helping drivers of all experience levels. You’ll see that our passion shines through in everything we do.

Product description

Permatex Water Pump and Thermostat RTV Silicone Gasket is a non-corrosive, sensor-safe RTV silicone gasket material formulated specifically for water pumps and thermostat housings. This gasket maker has the highest water-glycol resistance available in an RTV silicone. With a temperature range of -65 degrees fahrenheit to 500 degrees fahrenheit intermittent, these gasket makers offer significant performance advantages, excellent torque retention and hi-temp, sensor-safe properties. Extended warranties, engine sensors and new component materials such as aluminum, bi-metal alloys and high-tech plastics, have created the need for superior RTV silicone gasket makers in both OEM production and service applications. Permatex always has the right gasket maker for your application.

• Sensor-safe, noncorrosive RTV silicone gasket material formulated specifically for water pumps and thermostat housings
• Highest water-glycol resistance available in an RTV silicone
• Superior adhesion and flexibility; can be used as a gasket maker or dressing
• Temperature Range: -65°F to 500°F (-54°C to 260°C) intermittent
• Suggested Applications: Water pump and thermostat housings

User questions & answers

Question:	Hi good morning, I would like to know how long until you ship the item out
Answer:	Yes, the Lab will work with the iPhone XR.
Question:	As everybody actually waited 24 hours before putting coolant in
Answer:	Yes, the Lab will work the Google phone.
Question:	Is this a good thread sealer on a pipe fitting on and aluminum water pump
Answer:	Yes, the Lab will work with the iPhone 11 Max
Question:	Can this be used alongside a pre cut paper gasket
Answer:	The Polaroid Lab works with these phone models: iPhone: 6 and newer (excl. SE) with IOS 11.4 or higher. Android: most popular Android phones with screen width higher than 330 DP and with Android 7 and newer.

Product features

Permatex Water Pump & Thermostat RTV Silicone Gasket Maker

Permatex Water Pump & Thermostat RTV Silicone Gasket Maker is a noncorrosive, sensor-safe RTV silicone gasket material formulated specifically for water pumps and thermostat housings. Highest water-glycol resistance available in an RTV silicone

Product description

Prestone Radiator Stop Leak features a patented formula that quickly stops leaks in radiators, water pumps, and heater cores while also protecting against pitting and corrosion. Prestone Radiator Stop Leak takes sealing performance to a higher level by both stopping the leak as well as the corrosive condition that causes leaks in the first place. Its unique combination of natural and synthetic components provides the ability to seal leaks up to 0.020-inches x 0.5-inches. What makes this possible is the size, strength, and durability afforded by fibrous particles, the same materials in bulletproof vests. Prestone Radiator Stop Leak particles have been chosen to seal even large leaks without interfering with the flow through the radiator and heater core tubes. It also boosts corrosion inhibitors to protect against pitting and corrosion, which cause radiator leaks.

• Patented formula quickly stops leaks in radiators, water pumps, and heater cores
• Boosts corrosion inhibitors to protect against pitting and corrosion, which cause radiator leaks
• Combination of natural and synthetic components provides the ability to seal leaks up to 0.020" x 0.5"
• Seals even large leaks without interfering with the flow through the radiator or heater core
• Stops the leak as well as the corrosive condition that causes it

User questions & answers

Question:	Is this product silicate free. For a 1997 Cadillac Seville
Answer:	I returned this product because I sold the car
Question:	Do you have to use 50/50 antifreeze coolant or can you use water in replace of antifreeze
Answer:	You can. I wouldn’t. Antifreeze is also coolant. You should never put straight water in your radiator.

Product description

Original organic formula designed for use in radiator systems to seal leaks and prevent leaks due to casting porosity in engine components. Seals minor leaks and porosity in cooling systems. DEX-COOL compatible. Non-toxic.

• Non-toxic
• DEX-COOL compatible
• Engine application is based on liters of volume in cooling system
• Formulated for automotive use
• For use with all vehicles

User questions & answers

Question:	Will this work on a 06 scion tc
Answer:	It will work on pretty much anything. But eventually you'll need a new radiator, somewhere between 5000-20000 miles later, it's inevitable. It will just stall the radiator purchase until later.
Question:	i will be putting these in a 2003 chevy blazer do I need to fill the radiator then put the crushed tablets in how long do I need to run the car
Answer:	You can put them in crushed or put them in whole. Then just drive the car normally. What happens is the tablets will dissolve and over time, will fill in the small cracks or porous areas.I've had good results with these.
Question:	Is this product safe to use on dodge charger 2009 3.5l v
Answer:	Ya it's safe but these products aren't a fix. Just slows it up so you have time to fix it. And when you change whatever is leaking you have to do a coolant flush to get all the gunk out. This stuff turns muddy and will clog the leak . So once the leak is fixed you will want that muddy gunk out
Question:	Will this work on my honda accord
Answer:	Yes, I would Not be afraid to use them on anything liquid cooled. I think they are made of organic material and have always worked great on any vehicle that looses coolant very slowly. If you have a major leak, you would need to just do yourself a favor and get the leak fixed

Product description

K-Seal ULTIMATE is the simple, permanent fix for blown head gaskets, cracked heads and blocks, and porous engine blocks. Our unique formula works with all water-cooled engines – there’s no need to drain or flush your cooling system, and it doesn’t matter what kind of antifreeze or coolant you’ve used previously. Simply shake the bottle, pour K-Seal ULTIMATE into your cooling system, and you’re back on the road. Just one bottle of K-Seal ULTIMATE is enough to fix blown head gaskets and cracked heads in cars, SUVs and small trucks. For larger engines, simply use two bottles.

• REPAIRS IN MINUTES: Permanently fix blown head gaskets, cracked heads and cracked/porous blocks including aluminum heads in old and new cars. The only head gasket and block sealant that is 3rd party tested to meet ASTM D3147. Save time/money
• SEALS CRACKS AND STOPS LEAKS: A DIY alternative to costly repairs, our head gasket fix permanently seals cracks and holes! Quickly repair your blocks, leaking radiator, freeze plug, heater core and water pump casing with no adverse impact on efficiency.
• POUR AND GO: Our head gasket sealer is easy to use just shake, add to your radiator/overflow and run the engine! Unlike some competitive products, it mixes with all types of antifreeze, absolutely no draining, flushing or pulling the thermostat required.
• SCIENTIFICALLY TESTED: Safe, effective, our head gasket and block repair seals leaks up to 1/32 of an inch! Once cured, the repair withstands the high pressure of the combustion chamber, all without failing or clogging the cooling system. US Bestseller
• CUSTOMER SUPPORT: If our head gasket repair leak doesn’t seal your intake gasket, the system might be over-pressurized. Check the Technical Specification section of this page for extra instructions for a successful repair. Over 8 million bottles sold.

User questions & answers

Question:	what if car won't start
Answer:	Has to recirculate through the cooling system. Car has to be running. I can't see any other way around that.
Question:	Does it use Sodium Silicate
Answer:	Nowhere on the bottle does it say sodium silicate.
Question:	Is this any different from the smaller pour and go? I have already put that in the engine. If it does not work, can I add this
Answer:	I use this in antifreeze for a head leak Did work for some tine
Question:	Is it okay to continue to idle the car with engine and brake lights on with liquid coming out of radiator? It says to idle for 20 minutes
Answer:	The system should be sealed as the product circulates though it for the 20 minutes.

Product features

Permanent Coolant Leak Repair with K-Seal

Coolant leaks don’t have to result in costly repair bills – simply add K-Seal to your coolant system for a quick and permanent fix. K-Seal is scientifically tested, trusted by millions of customers worldwide, and the only coolant leak repair fluid carried by the AA, the UK’s largest roadside repair company.

K-Seal couldn’t be simpler to use. K-Seal’s unique formula will seek out holes and cracks, and permanently seal them, with no adverse impact on the efficiency of your engine cooling.

No Need for Expensive Head Gasket Repairs

K-Seal ULTIMATE K3501 Head Gasket Repair is the simple, permanent fix for blown head gaskets, cracked heads and blocks, and porous engine blocks.

Our unique formula works with all water-cooled engines – there’s no need to drain or flush your cooling system, and it doesn’t matter what kind of antifreeze or coolant you’ve used previously. Simply shake the bottle, pour K-Seal ULTIMATE into your cooling system, and you’re back on the road.

Common Coolant Leaks

K-Seal can deal with all of these leaks and more, as long as they are identified as early as possible. It is easy to use – simply shake it and pour it into the coolant mixture and it will work automatically.

Product description

Permanent pour 'n go head gasket & block repair compatible with all types of antifreeze. Repairs cooling system leaks w/3 unique technologies: military-strength fibers nanotechnology & Cool-X Conditioner-the ultimate solution for all coolant leaks.

• Easy Pour and Go Formula!
• Permanently fixes head gaskets, engine blocks, cooling systems, and cylinder heads.
• "Contains 3 unique technologies. Military-Strength Fibers create multi-layer repair over cracks with a web-like weave. Nanotechnology permanently fixes the smallest cracks and crevices. Cool-X Conditioner – lowers operating temperature as it circulates through cooling system."
• Seals larger holes with less fluid loss than competitive products as proven by lab test (ASTM D6107)
• Works with all antifreeze or plain water.

User questions & answers

Question:	My 01 Civic only took 1/2 of the mixture (1qt sealant + 3qt water), even after burping - it took no more. Is this OK
Answer:	run it
Question:	how clean it
Answer:	I wish to know that. I suggest all headache should go to the manufacturer because she did make function test except it does 'block the leaking'. I believe she does not know how to prevent the block of the coolant level sensor; how to prevent the trigger of high temperature warning from the temperature sensor of the engine...etc.
Question:	is there a limit to size of leak
Answer:	I had a small leak on the head gasket it sealed it fine I believe it would seal a larger leak, be sure to take your thermostat out and flush the cooling system at least four times follow the directions on the bottle.
Question:	How do I clean this crap out of my radiator? Followed directions and now my head gasket doesn't leak but my radiator is totally clogged. Rad was new
Answer:	It’s a 32 ounce bottle. If you’re putting it in a car you should only use 10 ounces. I wonder if you didn’t use a whole bottle, perhaps? I added a whole bottle to my Kenworth and my problem was solved. I had a Radiator seam leak in a plastic/aluminum radiator

Product features

MILITARY STRENGTH FIBERS

Contains sodium silicate reinforced with military-strength proprietary fibers with a high strength-to-weight ratio. The fibers form an interlocking web-like weave over the crack or breach ensuring a permanent, multi-layer, impenetrable repair.

NANOTECHNOLOGY

Features nanoparticles so small they reach into cracks and crevices other products can't. This makes the molecular bond of the repair stronger and more solid when permanently hardened to the surface area.

COOL-X CONDITIONER

Cool-X Conditioner circulates in the cooling system for lower operating temperatures and improved heat transfer long after the repair is made.

HOW TO USE

K&W FIBERLOCK is compatible with all antifreeze or plain water (generally for racing applications). Shake bottle vigorously for 30 seconds, pour directly into the radiator, turn heater on high and idle engine for 15 minutes. You're ready to drive. FIBERLOCK will form a permanent repair over time. Read label for complete instructions.

Product description

Easy to use. Do it yourself formula. Seal leaks throughout your vehicles cooling system. Stops antifreeze loss. Keeps your vehicle in safe operating condition. Compatible in gasoline and diesel engines. Safe for Northstar engines. Guaranteed to help seal any leaks in and around your cooling system. Contains no solid or particulate matter. Will not clog or harm your engine. Bonds to various, different materials such as metal, aluminum, cast, alloy, or plastic. Permanent repair for all cooling system leaks. Safe for all cooling system components. No flushing required. Safely mixes with all types of antifreeze/coolant.

• Easy to use
• Seal leaks throughout your vehicles cooling system
• Stops antifreeze loss
• Keeps your vehicle in safe operating condition
• Compatible in gasoline and diesel engines

Product description

BlueDevil Head Gasket Sealer is your head gasket repair solution as it will repair and seal leaks in blown head gaskets, warped or cracked heads, heater cores, and freeze plugs. BlueDevil contains no solid or particulate matter and will not clog or harm your engine. It bonds to metal, aluminum, cast, alloy, or plastic, and it’s safe and easy to use as a permanent seal for your head gasket leak. BlueDevil Head Gasket Sealer is compatible in gasoline and diesel engines.

• Good for Head Gaskets, Warped or Cracked Heads, Heater Cores, and Freeze Plugs
• Contains no solid or particulate matter that can harm a vehicles engine
• Alternative solution for costly and time consuming repairs
• Safe and easy to use
• Permanent Repair

User questions & answers

Question:	I don't get the "remove thermostat" part. If i remove my thermostat where am i going to plug the hose into? Does it mean to replace it with a new one
Answer:	Most thermostats can be removed without causing a leak. I am guessing that yours might be like my truck where the gasket is incorporated into the thermostat. If so, you can probably adjust the time to allow the thermostat to open and replace it afterward. I cut the guts out of mine but it was probably overkill.
Question:	If i just replaced my thermostat do i need to remove it, it's such a pia
Answer:	Yes. For a "perfect" flush, the thermostat needs removed. Pain as it is, it's a good time to replace it.
Question:	How do I return the product if I have already used it
Answer:	You can't.
Question:	Im getting combustion in my radiator,not coolant in oil,will it work
Answer:	had same problem and it didn't work