Best Head Gasket Sealer

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When it comes to buying the most reliable parts for your car, one thing you won’t want to skip over is the head gasket.

If your head gasket blows, then it can lead to some serious issues such as oil leaking and engine misfiring.

The best way to protect yourself from this problem is by having a good quality head gasket installed in your vehicle. This will ensure that your engine runs properly and efficiently without any problems.

However, another good method of solving this problem is by applying some head gasket sealer. But where can you find some reliable brands?

Well, we have compiled a list of some of the best head gasket sealers for you, so you won’t have to hunt that far.

Comparison Chart

61YD8lO8tmL. AC SY879
Gasgacinch Gasket Sealer
81XRQ2I8zuL. AC SX679
Permatex 80062 High Tack Gasket Sealant
81sQ+0h4UJL. AC SY879
Bar’s Leaks Block Seal Head Gasket Fix
Steel Seal Head Gasket Repair
Steel Seal Head Gasket Repair
K Seal Coolant Leak Repair
K-Seal Coolant Leak Repair

Our Best Head Gasket Sealer Reviews

Gasgacinch Gasket Sealer

Gasgacinch 440-B Gasket Sealer and Belt Dressing, 8 oz

This first gasket sealer is one of the most durable that we can find on the market.

It comes in an old-fashioned tin that you can get either in 8-ounces or 4-ounces. This means you’ll have more than enough sealant for your needs.

It’s also very easy to apply. All you need to do is simply open the lid and pour the contents into the engine bay. Then just let it sit there for about 10 minutes before closing the lid again.

The next time you start up your engine, you should notice a difference in how well it works.

This can be used in a wide range of environments, such as cold climates, hot surfaces or wet surfaces. It has a high resistance to heat and corrosion. It is also resistant to oil, heat and gasoline.

This sealant is very resistant, being both very flexible as well as heat resistant. You can be sure that this will give you complete coverage for upwards of a year.

This will bond with a variety of different materials such as steel, aluminum, titanium, magnesium and copper. This is amazing if you are going to want it for a number of materials.

You can use it to repair your truck, car or a whole range of automotive vehicles. It is resistant to natural engine fatigue and will also peel off your engine very easily.


  • Very effective at sealing leaks – you can really rely on this product if you are experiencing a dodgy gasket. This will keep your engine from leaking and prevent some serious engine failure.
  • Easy to apply – you can quickly apply this to any sort of surface, which makes it very effective for quick car repairs. It also will not peel away, which is great if you want it to survive all weather conditions.
  • Resistant to a lot of things – this will last through a lot of conditions, whether wet, dry, hot or cold, which is very important as your engine can experience all of these kinds of conditions.
  • Anti-fatigue – as you’ll know that all the parts of your engine will undergo lots of stress, so it is important that your sealant will last.


  • Can take a while to cure – this can also be susceptible to oxygen contamination while in the tin, which might cause the sealant to go bad.

Permatex 80062 High Tack Gasket Sealant

Permatex 80062 High Tack Gasket Sealant, 4 oz.

Next up, we have a gasket sealant that is extremely tacky – only in the sense that it will stick to your car like no other sealant that we’ve tried. This will result in a film that is not at all brittle and will last you for years.

The best thing about this product is that it doesn’t require much maintenance. You don’t have to worry about keeping it clean because it will naturally stay clean.

It is highly recommended for those who want to create a permanent solution to their leaky engines.

If you’re looking for something that won’t break down over time, then this is the perfect choice for you.

It can be applied to almost anything, including metal, rubber, plastic, glass and even wood. It will work on any type of material.

It comes in a tin that is quite large, but it does mean that you can get more than one application out of it. It is also easy to spread around, and it will cover a big area.

This gasket sealant will also survive some quite extreme temperatures and conditions.

It can survive in freezing temperatures that can hit lows of -65 degrees Fahrenheit. It can also resist propane and some extremely hot temperatures.

This comes with a brush that makes it extremely easy to use. You can also use it for pumps, timing chain covers and gaskets that are suffering from a little bit of wear and tear.


  • Extremely sticky – this means that it will stick to almost everything. You won’t have to worry about it coming away from the housing of your gasket, even if you have been gunning your car for months.
  • Easy to apply – you can just apply this to your engine and leave it there until it cures. It’s also easy to remove after it has cured.
  • Resistant to heat and cold – this will withstand some pretty intense temperature changes. It will remain intact even when exposed to boiling water or ice.
  • Long-lasting – this will last for many years, especially if you store it properly. The tin will protect its contents from damage, which will help it to last longer.


  • Not suitable for silicone seals – this isn’t suitable for silicone seals, so make sure you check before purchasing.

Bar’s Leaks Block Seal Head Gasket Fix

Bar's Leaks Block Seal Head Gasket Fix

If you are looking for antifreeze-compatible sodium silicate sealing liquid, then this is the best product to have.

Not only will it be able to resist some of the coldest temperatures, but it is one of the best products for repairing blown gasket heads.

It works by filling the cracks and crevices in your head gasket, allowing it to form a solid barrier between the cylinder walls and the coolant.

You can use this product on most types of vehicles, including cars, trucks and motorcycles. It will also work well on boats, snowmobiles and jet skis.

You can use it for both aluminum and steel head gaskets. It will cure quickly, so you shouldn’t have to wait long before using your gasket once again.

The container is made from durable plastic that will ensure that it remains protected during storage. It will keep all of its contents safe and secure inside the container. This will also completely repair cracked cylinder heads and blocks.


  • Sticky – this sealant will stay stuck to whatever surface you put it on. It will never come off and it will always hold fast.
  • Antifreeze compatible – this is great news for anyone who wants to fix their leaking head gasket without having to buy new antifreeze.
  • Quick curing time – this will cure very quickly, usually within minutes. It will take less than an hour to fully dry and harden.
  • Cures at room temperature – you don’t need to expose this to any kind of heat source to cure it. It will simply dry out as it sits.
  • Safe for use on antifreeze – this won’t harm your vehicle’s cooling system. It will only strengthen the integrity of your head gasket.


  • Clogs – this might cause clogs if you are applying it to an area that is already blocked. If this happens, you should clean up the blockage first.
  • Expensive – this is not cheap, so you may want to consider buying just one container, especially if you haven’t used it before.

Steel Seal Head Gasket Repair

Steel Seal Head Gasket Repair

This next sealant comes in pretty sizable bottles that will allow you to cover quite a large area.

It comes with instructions that are very easy to follow, which makes it great for anyone who has not tried fixing a blown gasket before.

This product contains a special formula that will fill any gaps and holes in your head gasket. It will do this by creating a strong bond between the metal surfaces of your head gasket and the cylinder wall.

You can apply this to almost any type of vehicle, including cars, trucks, SUVs and even motorbikes. It will also work for boats, lawnmowers and snowmobiles.

There are two different versions available, depending on whether or not you want to use it on aluminum or steel head gaskets, and they both contain the same ingredients.

You can use either version on either material.

This will really work on older vehicles whose gaskets might have seen better days. The reason why is because it will create a stronger bond between the head gasket and the engine block.

It will be able to withstand high temperatures, bonding to most cracks and fissures that will appear on the engine of your car.


  • Easy to follow directions – these instructions are simple to understand and follow. They make it easier to get started.
  • Highly effective – this product will create a strong bond between the head gaskets and the cylinders. You won’t have to worry about your engine blowing.
  • Will protect against leaks – this will prevent leaks from occurring when you start driving again.
  • Will last long – this will last for years, unlike other products that will eventually wear down over time.


  • Expensive – this isn’t cheap, but it does offer good value for money.
  • Not recommended for newer vehicles – this product is not suitable for newer vehicles. This is due to its high cost.

K-Seal Coolant Leak Repair

K-Seal Coolant Leak Repair

This next sealant is for those who want to save some money on their coolant repair.

This is compatible with almost all antifreeze products, which means that you won’t have to worry about it succumbing to the elements.

This uses sophisticated technology to completely get into all of the cracks, no matter how fine they are. This uses nanotechnology and microfibers so that no air, water or heat will be able to compromise the integrity of your blown gasket.

It’s designed to seal out any leaks that could occur inside the cooling system. This includes small pinholes, cracks and crevices.

The best thing about this sealant is that it doesn’t require any mixing or preparation. All you need to do is pour it directly onto the affected areas.

The only downside to this is that it does take longer than other similar products. However, if you’re looking for an affordable option, then this should definitely be considered.


  • Affordable – this is one of the cheapest options available. If you are looking to save money on your gasket sealant, then this might be a great first option for you.
  • Simple to use – there aren’t many steps involved in using this product. This is great for first-time users of gasket sealant.


  • Only effective on minor leaks – this may not be as effective at sealing larger holes, which will render this product redundant if you have significant damage.

Buyer’s Guide

Before purchasing any type of gasket sealant, it’s important to know what kind of vehicle you own. It’s also vital to consider the type of engine you have.

If you have a diesel engine, then you’ll probably want to buy something that works well with them. On the other hand, if you have an inline six-cylinder engine, then you’ll likely want to go for something that works well with that.

Here are a few things you’ll want to think about when buying your next gasket sealer:

The Quantity

You’ll obviously want to purchase enough gasket sealant to cover all of the damaged areas.

The amount that you need depends on the size of the hole or crack.

For example, if the hole is relatively large, then you’ll need more than if it was very small. You can always add extra later, but you don’t want to run out before you’ve finished repairing everything.

The Type

There are two main types of gasket sealants. These include liquid and paste-based products. Both work equally well, so it really comes down to personal preference.

The Price

As mentioned earlier, this product isn’t cheap. However, if you plan on doing a lot of repairs, then this might actually be worth the investment.

However, if you’re just planning on fixing up a couple of spots, then you’ll probably find better deals elsewhere.

Does It Work On Large Cracks?

While most people would assume that this product would work well on larger cracks, it’s not necessarily true.

There are some brands that claim that they can fix even the largest of holes, but we haven’t found much evidence to support these claims.

This means that you’ll need to test drive the product yourself to see whether it works on your specific car.

How Long Until You Can Use Your Car

Most people won’t notice anything different until their next oil change. However, if you’ve had extensive damage done to your cooling system, then you may experience problems sooner than expected.

In general, it takes anywhere from 3 days to 2 weeks for the gasket sealant to fully cure. Some people say that it takes less time than others, but it really depends on how long you leave it to dry.


When it comes to functionality, you should expect similar results to those of a standard gasket.

In fact, it’s often recommended that you replace your existing gaskets with new ones after applying the sealant.

Frequently Asked Questions

How Do I Apply The Gasket Sealant?

Most manufacturers recommend that you use a brush applicator. This allows you to get into tight spaces where a spray gun wouldn’t fit.

What Happens If I Apply Too Much Gasket Sealant? Will My Car Explode?

Unfortunately, there’s no way to tell without testing it first. If you accidentally apply too much, then you could end up damaging your engine.

Is It Safe To Use Gasket Sealant In Cold Weather?

Yes, as long as you keep the temperature below 40 degrees Fahrenheit.

Does The Gasket Sealant Affect The Performance Of My Vehicle?

No, it doesn’t have any negative effects on your vehicle.

How Much Should I Spend On The Gasket Sealer?

That’s a difficult question to answer because it really depends on what type of vehicle you own and how much sealant you’ll need to fix the affected area.

Is Gasket Sealer Toxic?

Yes, this stuff can contain some harmful chemicals, because it needs to bond firmly to the body of your vehicle.

You should try applying this during the warmer weather or indoors to give it the best chance of drying.


Gasket sealers aren’t perfect, but they do offer an easy solution to minor issues like cracked head gaskets. They also provide a cost-effective alternative to replacing them.

We hope that our list has helped you to decide which is the best gasket sealer for you.

Remember to read as many reviews of these products as you can, as this will be a very reliable method of knowing whether or not your sealant is effective or not.

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