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Best Head Gasket Sealer – Buying Guide and Recommended Products

Do you see white or blue smoke coming from your exhaust? Perhaps your engine’s overheating, or feels sluggish, underpowered and choppy? If so, it could be a blown head gasket.

A blown head gasket can mean oil and coolant mixing, loss of compression and loss of engine power, engine misfires and more.

If you suspect head gasket trouble, we’re here to help. Heading to a mechanic doesn’t always have to be your first solution, because the best head gasket sealer from our roundup of mini-reviews could be.

A mechanic holding a head gasket in his hand, standing over the engine

In this article, we’re going to detail what a head gasket is and how it works. We’ll also cover what could cause it to blow and the symptoms to look for. Next, you’ll learn about head gasket sealers and under what circumstances using one could work.

Finally, we’ve compiled a list of the top head gasket sealers on the market, so you can select the right one to to meet your vehicle’s needs.

Quick Links to Our Top Recommendations for Best Head Gasket Sealer

Note: Clicking the above links will take you to further information, current prices and customer reviews on Amazon.

What is a Head Gasket?

There are essential components your vehicle needs to function smoothly and safely. The best example is the engine, without which your vehicle wouldn’t work at all.

The engine of a car consists of many different mechanisms. All of these parts work together to power your vehicle. The head gasket plays a principal role in your car’s internal combustion process. It prevents coolant fluid and oil from mixing together.

This crucial part is located between the cylinders and the engine block. To access the head gasket, a mechanic must remove the engine block.

To understand the head gasket’s importance, let’s cover the basics of engine oils and coolants. This will help you to truly appreciate why it’s essential to prevent and/or fix a blown one.

The Importance of Engine Oil

Oil serves as a lubricant and cleaner for your engine.

While it’s running, an internal combustion engine is under a lot of pressure. The cylinders and pistons are in constant motion to generate energy. As you might imagine, constant friction is taking place.

Oil ensures that all the internal workings of your engine don’t wear down. This slick substance also clears debris out of the engine.

This is why you should prioritize staying on top of your oil changes. Oil doesn’t last indefinitely. The compounds that make it effective break down eventually. The result is a buildup of sludge and potential corrosion.

The Importance of Coolant

Coolant stops your engine from overheating. This liquid circulates through your cylinder head (or heads) and engine block to keep things cool.

No matter what the temperature is outside, coolant works to stabilize the engine temperature.

Coolant can withstand temperatures of either extreme. It enables your car’s engine to run during boiling summers and frigid winters alike. As with oil, your coolant fluid has to be changed every so often.

The Role of the Head Gasket

There are separate channels inside your engine block for coolant and oil. The head gasket seals these channels so the two can’t mix.

By providing a seal, it also maintains engine compression. This mechanism is what keeps your engine running smoothly.

Head gaskets are built to be durable. Typically, they are constructed from layers of steel. Other materials used can include aluminum, copper, and iron. Some include rubber for an extra tight seal.

The best materials for head gaskets are the ones that are heat-resilient. Aluminum is susceptible to a phenomenon known as thermal expansion.

When exposed to high temperatures, aluminum changes in shape and size. It expands, meaning that it’s likely to warp faster than other metals. A warped head gasket is an ineffective one. This is why we generally don’t recommend aluminum.

On their own, head gaskets aren’t costly to buy and the reason their repair runs high is because, as I’ve mentioned, they aren’t easy to access.

Removing a defunct head gasket and replacing it is a time-consuming process. This is a case where a basic understanding of how your vehicle works won’t be enough.

Exhaust manifolds must be taken out, valves loosened, and more. Then, everything has to be replaced exactly as it was. The exact procedure will differ, depending on the make and model of the vehicle.

Attempting head gasket removal without being certain of what you’re doing is dangerous. You could injure yourself or cause serious damage to your engine.

What is a Head Gasket Sealant? How Does it Work?

A head gasket sealer is a chemical liquid that will seal minor to moderate leaks. These products give you the chance to delay or avoid an expensive visit to your mechanic.

Remember, the head gasket is crucial because it prevents oil and coolant from mixing. It also stops these two liquids traveling to parts of the engine where they shouldn’t.

As we’ve touched on, getting to the head gasket takes knowledge, time, and effort. A sealer makes things straightforward. You won’t have to get anywhere near the actual head gasket to apply the sealant. Instead, you pour the sealer into your radiator or coolant reservoir. The sealer will circulate through your engine and patch up existing leaks.

Guidelines for use are specific to the sealer you use. Some are compatible with antifreeze, meaning you don’t have to drain your whole coolant system. All you need to do is keep your engine idling for a short while.

Others require that you drain all the coolant out and replace it with water. Then, you add the sealer and run your engine. You drain the whole system again before re-adding the coolant, and you’re done.

You should always follow the specific instructions for the head gasket sealer you purchase. If you don’t, you risk adding more problems on top of the leak.

Any sealer should be used in a ventilated area. Take this seriously—there’s no need to breathe in nasty chemical fumes.

There are several types of head gasket sealers. The earliest variations worked to seal leaks with materials such as wood pulp.

Nowadays, head gasket sealants are almost always chemicals. The exact ingredients are contingent on the product.

Sodium silicate is one chemical often found. Also known as liquid glass, it is used to stave off corrosion in certain metal structures. Sodium silicate is also capable of sealing tiny cracks in cement, ceramics, and metals.

In general, different sealers share several properties in common. Firstly, they have to be able to run through your engine without causing blockages.

Next, the chemical can’t corrode or otherwise damage any part of the engine. Finally, the chemical has to stick to the crack (or cracks) causing the leaks.

Certain sealers patch leaks almost instantly, while others take more time. The sealer works by building over any breached area until it’s completely sealed.

Newer head gasket sealers take advantage of nanotechnology for stronger sealing. Nanotechnology is all about compounds (liquids, gases, etc) working at an extremely small scale.

What Causes a Blown Head Gasket?

A blown head gasket just means one that isn’t working as it should. This term can refer to anything from one or two small leaks to a deformed, warped gasket.

The core cause of a blow out is excessive engine temperatures. In turn, this can be due to a range of issues. We’re going to list some of the most prevalent reasons why your engine could be overheating.

Staying on top of your vehicle’s maintenance is the best way to reduce the chances of problems. If you suspect a blown head gasket, consider the following possible culprits:

Low Coolant Levels

Take a look at your car’s coolant or antifreeze reservoir to see if it’s full. If your vehicle is an older model, you might not have a coolant reservoir.

Instead, you’ll have to open the radiator (when the engine is cool!) and look inside. If there isn’t enough coolant circulating in your engine, it’s going to get hot in there.

Old Coolant

Forgetting to change your coolant can lead to blown head gaskets. As with oil, coolant loses its ability to keep things cool as it ages.

Check the owner’s manual for your vehicle to know how often you should be adding fresh coolant.

Coolant comes in vibrant colors—red, blue, green, or yellow. These colors correspond to the composition of the antifreeze.

If you see that your coolant is colorless or has debris in it, it’s time for a change. Be sure to flush all the old coolant out before adding new coolant.

Worn Out Tubes

If the tubes that bring the coolant in and out of your radiator are worn out, the whole system can fail. If you see bulges or cracks, they’ll have to be replaced. The same goes if the tubes feel squishy to the touch.

Clogged Radiator

A clogged radiator won’t circulate coolant as it should. Blockages can be either internal or external. If you see that your radiator is filthy on the outside, hose it down. Air needs to be able to enter the radiator for it to work.

If this doesn’t work, the clog may be internal. It could be a build-up of rust or debris. In this case, it’s best to have a mechanic examine it.

Broken Fan

The fan in your vehicle is a vital piece of equipment. It operates alongside the internal cooling system to keep your engine from overheating.

If your fan is making a lot of noise, it could be worn down. Other signs of a malfunctioning fan include the engine heating up quickly when your car is idling.

Pushing an Overheated Engine

If you know your engine is overheating, don’t ignore it. Driving when the engine temperature is in the red zone can cause your head gasket to blow.

You could also irreparably damage other mechanisms inside your engine.

Poor-Quality or Old Head Gasket

If your head gasket is made of lesser quality materials, it won’t be as durable. This is likely to occur in second-hand vehicles where themanufacturers original has already been replaced in a previous repair.

Older head gaskets can wear down and fail too. The ones in vintage vehicles tend to be less hardwearing than newer models.

How to Tell Your Head Gasket is Blown? What are the Symptoms?

Every vehicle owner needs to be aware of the signs of a damaged head gasket. This isn’t the type of thing you can ignore, or pretend isn’t happening. If allowed to escalate, it can destroy your catalytic converter. This is related to your vehicle’s emission control system.

It lowers how much noxious gas (e.g. carbon monoxide) your vehicle produces. Aside from that, catalytic converters don’t come cheap.

This is only one of the grave consequences a blown head gasket can have. Other internal workings from hoses to the engine cylinders can end up destroyed. Your engine could even catch fire.

Luckily, a blown head gasket often presents clear symptoms. If you notice any of them, it’s safe to say yours is blown.

Depleted Coolant or Oil

An early symptom of a blown head gasket is depleted coolant or oil. If you’re refilling your coolant or oil too often, there could be a leak.

Bubbly Coolant

A damaged head gasket can force gas into the coolant reservoir or radiator. This will present as visible bubbles, even when the engine is cool.

Deposits on Spark Plugs

Burning antifreeze can leave deposits on your spark plugs. This white build-up usually appears around the electrode and ground strap.

Overheating Engine

If your engine keeps overheating, a blown head gasket could be at fault. In addition to being the cause, an overheated engine can also be a symptom.

Choppy Engine

The head gasket also regulates compression inside your engine. A lack of compression will cut down on your engine’s overall power.

Your engine might sound choppy or whiny. Your vehicle won’t accelerate normally without optimal compression.

White Exhaust Smoke

White smoke coming from the exhaust can be a sign of a blown head gasket. If leaked coolant hits the engine cylinders, it will be heated into steam.

The steam is then blown straight out of your exhaust pipe. Smoke from a blown head gasket has a distinctive sweet smell. You may also see water dripping from your exhaust along with this white smoke.

Blue Exhaust Smoke

Leaked oil from a blown head gasket can also cause unusual exhaust smoke. As with the coolant, the oil will hit the cylinders.

The oil interacting with the super-heated cylinders produces a blue-tinged smoke. Note that if the leak is large enough, the oil could catch fire.

Milky Oil or Oily Coolant

If the oil on your dipstick is milky-looking, it’s contaminated with coolant. The opposite applies to your coolant. An oily film on the surface of your antifreeze isn’t normal.

Does a Sealer Always Solve a Cracked Head Gasket?

No, it’s not always a permanent solution. If your head gasket is actually warped out of shape, sealer won’t be able to fix the problem.

A badly warped head gasket physically can’t form a seal. No amount of sealant will work on large breaches. Similarly, it won’t do much for numerous, large leaks. If your engine overheats after a few minutes of idling, go to a mechanic.

How Long Does a Head Gasket Sealer Work?

There’s no conclusive answer to how long it will work. This is contingent on individual variables, such as the condition of your head gasket and the number of leaks.

The type of sealer you buy matters too. Certain chemicals can wear down, exposing the breach. Other variations are supposedly permanent sealers.

The problem can get worse over time. If the symptoms of a blown head gasket return, the sealer has stopped working. Or, this could mean that new leaks elsewhere in the engine have formed.

If the damage is minimal, a sealer can work for a long time. As to whether that will be weeks, months, or years—it all depends on you. Maintaining your vehicle correctly will help prolong the sealer’s longevity.

Compatibility – Gasoline or Diesel

Diesel and gasoline engines are distinct from each other. They have separate ignition, outputs, and starter motors.

The head gasket sealer you choose has to be compatible with your engine. Always read the label before purchase.

Not all sealers work with gasoline engines and vice versa for diesel. Some brands are compatible with both and can be used on any vehicle. An incompatible sealer might not work, or can even cause damage.

You can also pick a head gasket sealant designed for specific engine sizes. For example, six cylinders, eight cylinders, etc.

Experience Level

Every sealer comes with unique instructions. You have to factor in your own ability to apply it correctly before you make a purchase.

For example, some brands require that you flush or drain your coolant system. You might have to remove your car’s thermostat and re-install it.

If these steps sound daunting to you, stick with a beginner-friendly brand. There are head gasket sealers designed for people who aren’t car-savvy.

Best Head Gasket Sealer – a Detailed Look at Our Top Recommendations

By now, you should know if your vehicle is a candidate for treatment with a sealer or not. Below we’ve reviewed eight of the best head gasket sealers on the market to help you choose a top product that’s suitable for your vehicle.

Steel Seal Blown Head Gasket Fix Repair Sealer – 8 Cylinder

Steel Seal Blown Head Gasket Fix Repair Sealer - 8 Cylinder

Those of you with bigger engines can use this product. You’ll get two bottles, suitable for eight-cylinder engines.

If you’re nervous about applying a sealer, this is the product for you. Steel Seal has explicit instructions on the bottle that anyone can follow.

The instructions cover several scenarios, including helpful tips. These include a bubbly radiator, water in your oil, or an expansion tank. The guidelines will tell you how to prepare your vehicle under each circumstance.

Steel Seal is appropriate for treating common blown head gasket symptoms. This encompasses watery oil, white exhaust smoke, external leaks, and engine overheating.

This blown gasket fix repair sealer is also suitable for vehicles that aren’t roadworthy. If your car is in rough shape, you can idle the engine for 30 minutes.

The label makes it clear that Steel Seal doesn’t work with all types of antifreeze. Still, there is a short list of recommended antifreeze for your convenience. You won’t have to

spend time puzzling over which coolant to choose.

Blockages won’t be a concern with this sealer. This liquid works by bonding to cracks or breaches when exposed to high temperatures. There aren’t any particles or materials that can build up and cause issues.

Features and Specifications

  • Two bottles.
  • Compatible with diesel and gasoline engines.
  • Made for 8-cylinder engines.
  • 30-day return policy if not satisfied.
  • Works within 30 minutes to one hour.

What We Like

  • Clear instructions.
  • Works rapidly.
  • Treats standard and serious symptoms.
  • Won’t damage or clog coolant system.

What We Don’t Like

  • Not compatible with all types of antifreeze.
  • Must have pre-existing knowledge of cars to use.


Do you have moderate to severely blown head gasket symptoms? This product might be ideal for you. If you’re unsure of what you’re doing, the clear instructions are a great bonus.

Click the link below to learn more.


Click to Learn More / Buy from Amazon


Atp at-205 Re-Seal Stops Leaks, 8 Ounce Bottle

ATP AT-205 Re-Seal Stops Leaks, 8 Ounce Bottle

The ATP AT-205 sealer is perfect for vehicles suffering from multiple issues. It can work to rejuvenate rubber seals as well as gaskets. It’s also rated for use on power steering and transmission.

This sealer is versatile and can work with gasoline and diesel engines. Whether you have an automatic or manual transmission, ATP AT-205 is suitable.

ATP’s sealer is devoid of petroleum distillates that are capable of dissolving rubber. Needless to say, this isn’t something you want circulating in your engine. Weak or worn rubber sealants can contribute to leaks.

ATP AT-205 can also improve the flexibility of your rubber seals. As a plasticizer, it can help condition older, dried out rubber. It can also clear sludge out of your engine to improve fluid circulation.

Novices, as well as experts, will appreciate the simplicity of this sealer. One bottle should be enough to treat a standard vehicle’s oil or coolant system (six quarts).

You won’t even have to change your oil before or after you use it. Flushing out your cooling system won’t be necessary either—just add it to your radiator. Of course, it’s preferable to do both of these things if your vehicle is due for them.

As long as the leak isn’t too severe, ATP’s sealer will close it up. A huge benefit of this sealer is that repeat applications are not necessary. Once a breach is sealed, it stays that way long-term.

Features and Specifications

  • Bottle capacity: 8 ounces.
  • One bottle treats six quarts of fluid.
  • Compatible with diesel and gasoline engines.
  • Seals mild to moderate leaks within five hours.

What We Like

  • Works for more than just head gasket leaks.
  • Compatible with all types of oils.
  • No draining or flushing needed.
  • Conditions seals.
  • Clears sludge.
  • Long-lasting.

What We Don’t Like

  • Takes up to five hours of driving to seal leaks.
  • Doesn’t work on badly cracked heads.
  • Can dissolve internal paint, causing blockages.


If you want a sealer that’ll last a long time and act as a conditioner for older rubber seals, ATP-205 will work for you.

See this sealer for yourself here.


Click to Learn More / Buy from Amazon


K-Seal St5501 Multi Purpose One Step Permanent Coolant Leak Repair

K-SEAL Coolant Leak Repair, ST5501 8oz, Multi-Purpose Formula Stops Leaks in the Radiator, Head Gasket, Block, Water Pump Casing, Heater Core, and Freeze Plug - Pour and Go - Trade Trusted-Stop Leak

This product will appeal to inexperienced vehicle owners. As the name suggests, there’s only one main step involved in applying it.

Shake the bottle and pour the contents into your coolant reservoir or radiator and you’re good to go. You’ll only have to keep your engine idling for a maximum of three minutes to plug the leaks.

A standout feature of this sealer is compatibility. It can be mixed with any antifreeze safely. This saves you the chore of draining and flushing your coolant system.

Plus, it can seal leaks in other areas, such as freeze plugs, water pump casing, engine blocks, and heater core.

This sealer uses a form of nanotechnology in the way of microfibers. These microfibers bond to the breach and mesh together. These microscopic fibers are too small to cause blockages elsewhere in your engine’s circulatory system.

Features and Specifications

  • Bottle capacity: 8 ounces.
  • Particles seal leaks up to 0.635 millimeters (0.025 inches) in size.
  • One bottle treats up to 12 cylinders.
  • Ceramic formula.
  • Compatible with all types of antifreeze.
  • Works within one to three minutes.

What We Like

  • No draining or flushing needed.
  • Simple to use.
  • No waiting necessary—works within minutes.
  • Keeps leaks patched long-term.

What We Don’t Like

  • Works for minor leaks only.
  • Discolors certain brands of antifreeze.


If you have a small leak and are unsure where your leak is located, this sealer is ideal for you. It’s also great for vehicle owners with little to no practical knowledge.

Take a look at this head gasket sealer here.


Click to Learn More / Buy from Amazon


Bar’s Leak Hg-1 Head Seal Blown Head Gasket Repair

Bar's Leak HG-1 HEAD SEAL Blown Head Gasket Repair

If your vehicle’s engine overheats quickly, Bar’s Leak HG-1 might be the solution. This head gasket sealer is rated for use on vehicles that overheat fast.

The minimum requirement is that your vehicle has to be able to idle for 15 minutes without overheating.

You won’t have to flush out your coolant system before or after use either. It can be mixed with the contents of any cooling system, whether antifreeze or water.

The exception is if you have existing blockages or a dirty coolant system. In this case, you’ll have to flush it beforehand.

This sealer is made up of sodium silicate and carbon fiber particles. It also contains a patented solution to reduce overheating as it circulates.

This product can seal breaches in all sorts of materials. It can bond to plastics, iron, aluminum, copper, and cast iron. Even if you’re dealing with bubbles in the coolant reservoir, you can use Bar’s Leak HG-1.

You’ll be able to get your vehicle back on the road in less than an hour. The total treatment time is less than 45 minutes.

Features and Specifications

  • Bottle capacity: 33.8 ounces.
  • Compatible with gasoline and diesel engines.
  • Mixes with all types of antifreeze and water-based coolant systems.
  • Works within 45 minutes.

What We Like

  • Can be effective on larger
  • Keeps mild to moderate leaks plugged long-term.
  • Works on vehicles that overheat rapidly.
  • Suitable for bubbly radiators.

What We Don’t Like

  • Can cause blockages in radiator or heater core if not flushed.
  • Sealer is thick and takes time to pour.
  • More severe breaches can reopen soon after application.


Those of you with little experience and vehicles in bad shape can make use of Bar’s Leak HG-1 head gasket sealer.

If you want to learn more about it, click the link:


Click to Learn More / Buy from Amazon


Bluedevil Head Gasket Sealer – 32 Ounce

BlueDevil Head Gasket Sealer (38386)

If clogs are a concern for you, BlueDevil sealer is a good choice. This sealer doesn’t contain any solid matter or particulates. It’s liquid only, the primary ingredient being sodium silicate.

A blown head gasket can result in deterioration to the internal workings of your engine. The particulate-free solution guarantees no further wear and tear. You don’t want to add more problems on top of the ones you already have.

To use it, your coolant system has to be flushed out. You’ll also have to remove the thermostat. These steps are to ensure the sealer circulates as thoroughly as possible.

As you’d expect with sodium silicate, it can bond to nearly any material. Whether you have a leak or a crack in metal or rubber, this sealer can plug it up.

An attractive feature of this BlueDevil sealer is durability. As long as the damage isn’t severe, you can expect leaks to stay sealed for thousands of miles.

Features and Specifications

  • Bottle capacity: 32 ounces.
  • Works in 50 minutes.
  • Free of particulates or solid matter.
  • Compatible with gasoline and diesel engines.
  • Treats four and six-cylinder engines.

What We Like

  • Can’t cause blockages.
  • Bonds to all materials.
  • Treats common blown head gasket symptoms.
  • User-friendly.
  • Long-lasting.

What We Don’t Like

  • Must flush coolant system and remove the thermostat.
  • Not suitable for bigger engines.


If you want to use a head gasket sealer once and be done with it, BlueDevil will do the job.

This product is available for purchase at the following link:


Click to Learn More / Buy from Amazon


K&W 401232 Permanent Head Gasket & Block Repair With Nanotechnology

K&W 401232 32 Fluid Ounce Automotive Accessories

If you’re mechanically savvy, you can make use of this head gasket sealer. Users who enjoy getting up close and personal with their cars will like this product.

You’ll get a chance to clean your cooling system out thoroughly. You actually have to drain and flush your coolant system more than once. In the process, you’ll be getting rid of any blockages or clogs you may have.

The directions detail every step you have to take from start to finish. Again, as long as you’re familiar with how your vehicle works you shouldn’t have any trouble.

This sealer uses nanotechnology. Crevices, cracks, and leaks are filled with flexible nanoparticles. This flexibility allows the sealer to hold even if plastics or metal contract and expand.

The nanoparticles are also resilient to the harsh environment inside your engine. They’re designed to withstand extreme temperatures and pressure.

You can use the K&W nanotechnology sealer on nearly any vehicle, gasoline or diesel. The same is true of engine size: it’s suitable for use on four to eight cylinders.

Beginners who want to give K&W sealer a try can do so. Bring your vehicle to your mechanic. The visit will still cost you less than repairing a blown head gasket.

Features and Specifications

  • Bottle capacity: 32 ounces.
  • Takes up to 15 hours to work.
  • Treats four, six, and eight-cylinder engines.
  • Compatible with gasoline and diesel engines.

What We Like

  • Seals small breaches long-term.
  • Cures early symptoms of a blown head gasket.
  • Great for DIY mechanics.

What We Don’t Like

  • Not beginner-friendly.
  • Takes time to work.
  • Misuse can cause severe engine damage.


Would-be mechanics will appreciate the work involved with using this product. If you’re a novice, head to your local mechanic with a bottle.

If you want to know more about it, follow the link below:


Click to Learn More / Buy from Amazon


Bar’s Leaks 1111 Head Gasket Fix – 24 Oz

Bar's Leaks 1111 Block Seal Permanent Head Gasket Fix 24 oz.

This particualr product is perfect for treating early signs of head gasket trouble. It’s easy to use and can treat vehicles that overheat quickly (after a minimum of 15 minutes).

Anyone can use this sealer, regardless of skill level. You only have to pour it into your radiator and top it off with your coolant of choice. Since it can be mixed with any brand of antifreeze, compatibility is a non-issue.

After 20 minutes, your car will be ready to drive again. This sealer is effective at patching up minor leaks and breaches.

Bar’s Leaks 1111 sealer contains sodium silicate and nanoparticles. These compounds work together to bond to metals or plastics, filling leaks. The high temperature in your engine hardens the sealer.

This product is an excellent preventative. As long as the leaks haven’t escalated to moderate or severe, you’ll save yourself time and money. Repeat applications will likely be unnecessary with these sorts of leaks.

A single bottle will treat systems as large as sixteen quarts. This is more than enough for the majority of vehicles.

You won’t have to bother with flushing your coolant system if it’s clean. As with other Bar’s Leaks products, flushing is recommended for dirty systems.

Features and Specifications

  • Bottle capacity: 24 ounces.
  • Mixes with all types of antifreeze.
  • Compatible with gasoline and diesel engines.
  • Works in 20 minutes.
  • One bottle treats six to sixteen quart systems.

What We Like

  • Successful at treating early head gasket issues.
  • Can be used on vehicles that overheat quickly.
  • Easy to use.
  • Lasts for thousands of miles.

What We Don’t Like

  • Can cause clogs in dirty coolant systems.
  • Doesn’t work on larger breaches.


This sealer is ideal for users with vehicles that aren’t too far gone. If you’ve recently noticed indications of a blown head gasket, Bar’s Leaks 1111 is for you.

Follow the link below to see this product for yourself.


Click to Learn More / Buy from Amazon


K&W 401224-6 Fiberlock Head Gasket & Block Repair – 32 Fl Oz

K&W 401224-6 FiberLock Head Gasket & Block Repair - 32 Fl Oz

If you suspect your blown head gasket is serious, this sealer might work for you. Consider it as a last resort before giving up on your vehicle.

An added benefit is that it isn’t difficult to use. Uncap your radiator and pour it in. Then, leave your vehicle to idle with the heat on for 15 minutes.

As with other K&W sealers, it can be mixed with any coolant. There won’t be any need to flush your coolant system and buy a new brand of antifreeze.

This heavy-duty sealer includes nanotechnology in the formula. The sealer can reach and seal breaches throughout your coolant system and head gasket.

The product forms a multi-layer web over the offending area. It also uses a conditioning agent to improve the transfer of heat in your engine.

Features and Specifications

  • Bottle capacity: 32 ounces.
  • Mixes with all types of antifreeze.
  • Compatible with gasoline and diesel engines.
  • Works in 15 minutes.

What We Like

  • Seals large as well as small leaks.
  • Keeps leaks plugged for a long time.
  • Little effort involved to use it.
  • Includes conditioning agent (Cool-X) to regulate temperature.

What We Don’t Like

  • Can cause radiator clogs.
  • Applications may need to be repeated for severe leaks.


If you’re dealing with multiple blown head gasket symptoms, this product may be a saving grace.

Buy a bottle for yourself at the following link:


Click to Learn More / Buy from Amazon



Head gasket sealers can save you a considerable amount of expense. In many cases, these products can prolong the lifespan of a blown head gasket for a good lentgh of time, saving money in repair costs.

In our opinion, the best head gasket sealer is Steel Seal blown head gasket fix repair sealer. This product is engine-friendly and produced by a reputable manufacturer. It can eliminate symptoms, ranging from minor to major, and have your engine running smoothly again.

Do you have any questions, feedback, or comments for us? Please share your opinion in the comments, we’ll answer every single one!


Product image credits: © Amazon.com

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From childhood go karting and motocross, to collecting and obsessing over scalextric, matchbox and radio controlled cars, I've always had an obsession with cars. Learning through manuals, books, trial and error, and more knowledgeable family members, I've also enjoyed tinkering with the mechanics and electronics of any vehicles I've owned. Now, over 3 decades later, I've started this site as a place for me to share my knowledge, to teach others how to care for and maintain their vehicles themselves, at home, so they can get the most of their vehicles and save a pretty penny compared to always seeking out professional help.

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