Best Head Gasket Sealer– Reviews & Buyer Guide


Last Updated on 3 weeks

A blown head gasket is probably a car owner’s greatest nightmare. It can turn your prized possession into a useless and costly scrap of metal, in an instant.

The inability to drive somewhere is inconvenient, but the resulting expense is the one that will concern you the most. Garage labor costs, potential head skimming work, and a large list of parts can quickly mount up to a substantial cost in the hundreds of dollars.

A head gasket is an important component that requires no maintenance and only reminds you of its presence when it fails to seal properly.

This can result in unpleasant situations, such as coolant and oil mixing, which can lead to catastrophic failure. This type of problem can also result in a variety of other problems, including engine misfires and oil leaks.

You have the option of replacing the complete head gasket or using a head gasket sealer. If you don’t want to involve a professional, get a head gasket sealer and solve the issue yourself.

It’s a considerably less expensive option that, depending on the circumstances, can be very effective in resolving the issue. It can be difficult to find the best head gasket sealer for your needs because there are so many accessible online and in stores.

When your car’s head gasket blows, your mechanic may have a difficult time repairing the leak. On the other hand, abandoning it will severely harm your engine, resulting in further costs. A good gasket sealer can get the job done with less downtime until the damaged gasket can be replaced. 

But how can you know which sealant will perform best for your vehicle among the hundreds of available products on the market? Don’t worry, we have got you covered.

Here you will get to know about the best car gasket sealers that will help you solve your problems in a less expensive and more efficient way.

Things to Consider Before Buying the Best Head Gasket Sealer:

Head gaskets are hard mechanical seals or components that are utilized in between the machine’s cylinder heads and engine blocks to prevent fluid or gas leakage when they are under compression.

They are reasonably priced, however, replacing them might be quite costly. When selecting a head gasket sealer, make sure to read the instructions carefully.

It is strongly advised that you purchase from manufacturers who offer a money-back guarantee in the event that the product you select fails.

They are worth trying out because of their affordable prices, especially when they are guaranteed. Before ordering or purchasing any head gasket sealer, you should check out user reviews on the manufacturer’s website and online stores.

Engine Type

Diesel and gasoline engines are the two most common types of engines. Different types of sealants may be required for these engines.

If you’re looking for a high-quality sealant for your head gasket, make sure to look into the benefits the product offers for your engine type.

Treatment Time

The majority of sealants have an activation period during which you are unable to drive the vehicle. The cure time must be specified in the product instructions.

Most will take approximately an hour, but some will take longer depending on the radiator capacity.  The head gasket is sealed in the shortest amount of time (approximately 15 minutes) using some sealers.

However, if you have the patience or the time to wait for the sealer to dry, don’t be afraid to buy sealants that take longer to cure.


Despite the fact that the sealant is measured in ounces, it is common for manufacturers to mention the engine size or the number of cylinders the sealant can repair successfully.

You must ensure that you have adequate products to cure your vehicle effectively, with quantities ranging from 8 ounces to a couple of gallons.

Purchase a sealant that will suffice your needs. The 16-ounce jar would be adequate to seal a blown head gasket on smaller engines and get you to your destination.

It is indeed a good idea to keep a small container on hand in case of an emergency.

Effect Stability

It’s also crucial to consider how long the effects of the head gasket sealers will last. What you’re searching for is a long-term fix rather than a fix that you’ll have to keep applying.

Also, it’s not like you’ll be able to tell when it’s time to add more sealer because you’ll only notice when problems arise again, and you don’t want to wait for that to happen.


Head gasket sealers are available in a variety of formulas. Some of them are aerosol sprays, while others are liquids that are poured in.

Some need brushing antifreeze and other solutions into your car’s engine and cooling system, whereas others are just pour-and-go. Use a pour-and-go bottle of sealers to opt for an easy, quick, and simple option.

Ensure that it functions properly without requiring you to do any preliminary procedures. It’s as simple as pouring a sealant into the radiator to fix a head gasket leak.

Other complications, though, may develop, necessitating significant technical knowledge of the sealing process. Make sure the product you purchase has detailed instructions on how to fix various leaks.

Activity Time

You won’t be able to drive your car for a while after applying the sealant. As a result,  you’ll have to wait for the sealant to dry.

You would prefer something that works quickly so you don’t have to wait long to restart your car’s engine and get back on the road.

Most head gasket sealers can take up to an hour or more to perform their job, depending on the car’s radiator capacity and size.

It’s still important to make sure the sealers operate properly, even if it takes a little longer than one that works quickly but only lasts a short period.


Head gasket sealers in tiny containers weighing under 16 ounces are included in the price range of under $20.

The contents of these containers can help you successfully handle leaks related to the head gasket, while larger engines may require a larger container.

Look into goods in the price range of $25 to $50 if you’re searching for a larger container that can cure a few leaks. The fluid in the containers is usually 32 ounces.

That’s enough to handle engines with six and eight cylinders. Premium products are available in a higher price range.

These are reputed brand sealers that can permanently repair broken head gaskets.

Larger engines, such as six-cylinder engines and others, can also be accommodated by the quantity.


Sealers are frequently portrayed as multipurpose items, meaning they can be used as permanent or temporary cures for various engine-related difficulties in addition to sealing your vehicle’s head gasket and sheltering you from leaks and other engine problems.

There are products available to help with a variety of engine issues. Even if you only have a head gasket problem, you can discover a sealant that will fix it as well as perform a variety of other functions. 

To learn more about what else the sealant can achieve, check the product description. Problems with the cooling system, radiator, cylinder heads, engine block, and other components are among them.

If you wish to deal with these difficulties all at once, you can save money by getting a multipurpose head gasket sealer rather than buying a remedy for each one separately.


One of the first things you should look into is whether or not the head gasket sealer is suitable for your vehicle’s engine.

Otherwise, instead of solving the problem, you will exacerbate it indefinitely.

There are specific sealers designed for diesel engines, some for gas engines, and some that only function with water-based cooling systems, however, there are also antifreeze-compatible head gasket sealers.


Before using sealants, you should read the instructions carefully. Some kinds, for example, require you to drain the coolant out before pouring the sealer into the engine, while others require you to remove and reinstall the thermostat. Before you buy, think about how you’ll utilize the sealant.


BlueDevil Head Gasket SealerBlueDevil Head Gasket SealerWorks in 50 minutesCheck Price
K-Seal Leak RepairK-Seal Leak Repair1 bottle treats 12 cylindersCheck Price
Bar’s Leaks Head Gasket FixBar’s Leaks Head Gasket FixCompatible with gasoline and diesel enginesCheck Price
Steel Seal Head Gasket SealerSteel Seal Head Gasket Sealer30-day return policyCheck Price
ATP Leak StopATP Leak StopCompatible with all type of oilsCheck Price
Bar’s Leaks Head Seal GasketBar’s Leaks Head Seal Gasket Mixes with all types of water coolantsCheck Price
Permatex Right Stuff GasketPermatex Right Stuff Gasket Long-lasting applicationCheck Price
K&W Permanent Head GasketK&W Permanent Head Gasket Great for DIY mechanics.Check Price

BlueDevil Head Gasket Sealer

BlueDevil Head Gasket Sealer - BEST HEAD GASKET SEALER

The BlueDevil gasket sealer is simple to apply a sealer which will save you money on car repairs. Apart from the radiator core, it is also a professional-grade head gasket sealer that fixes leakage difficulties with heater cores, freeze plugs, and other coolant-related components. The sealer provides a lasting leakage repair solution if you follow the directions carefully.

Its formulation is devoid of any solid or particle debris that could harm an engine. A 32-ounce (946 ml) radiator flush and a 32-ounce sealer are included with the package.

The application of the head gasket sealer is also rather simple, so you may do it yourself. Simply pour it in after flushing the radiator, secure the lid, and wait 50 minutes while keeping an eye on the engine.

Your coolant system must be cleaned out before you can utilize it. The thermostat must also be removed. The purpose of these stages is to ensure that the sealer circulates as much as possible.

Sodium silicate, as you might think, can attach to almost any material. If you have a leak or a break in metal or rubber, this sealer will stop it.

The BlueDevil sealer’s durability is one of its most appealing features. The leaks can stay sealed for thousands of kilometers as long as the damage isn’t severe.

Brand: BlueDevil Products
Model: 38386
Item Weight: ‎2.87 pounds
Dimensions: ‎10.31 x 4.8 x 4.17 inches
Size: 1 pack
Model No: 38386
ASIN: B000NOO798

Key Features
  • 32-ounce bottle capacity
  • Free of solid materials or particles
  • Works in 50 minutes
  • Treats 4 to 6-cylinder engines
  • 60-day money-back guarantee
  • Professional grade
  • Affordable
  • It fixes leaks, wraps, and cracks
  • Bonds to all materials
  • Does not cause blockage
  • Always use it as a fresh coolant
  • Not suitable for bigger engines

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 Why Choose This: 

  • Works well for both gas and diesel engines, regardless of cylinders.
  • It is user-friendly and long-lasting.
  • It does not cause blockages and bonds to all materials.
  • It fixes with different types of materials like alloys, cast iron, etc.

K-Seal Leak Repair


K-Seal provides a new step in gasket sealers. It is a “shake, pour, and go” head gasket sealer with a reasonable price tag. The fact that it’s compatible with all kinds of antifreeze products eliminates the requirement to flush out the coolant system before use.

It’s a multifunctional product that can be used to fix leaks in the heater core, engine block, water pump casing, and freeze plugs.

This product appeals to those who have never owned a car before. There is only one step to applying it, as the name implies. This product’s recipe incorporates microfibers that entangle to seal cracks and leaks, which is a type of nanotechnology.

The product comes in a 16-ounce jar that treats up to 55 quarts of water. To fix the leaks, you’ll only need to keep your engine running for a maximum of three minutes.

The interoperability of this head gasket sealer is a remarkable feature. It can be safely used with any antifreeze. This eliminates the need to drain and flush your cooling system.

Manufacturer: ‎K-Seal International Limited
Model: ‎K-Seal Coolant Leak Repair
Item Weight: 274 g
Dimensions: 4.4 cm L x 8.8 cm W x 12.6 cm H
Model No: ST5501
Size: 1 bottle

Key Features
  • Bottle capacity 8 ounces
  • Ceramic formula
  • Compatible with all types of anti-freeze.
  • Works within 1-3 minutes
  • 1 bottle treats 12 cylinders
  • Ideal for bigger vehicles like RVs, Tractors
  • Keeps leaks patched long-term
  • Seals head gaskets, block radiator
  • Permanently seals holes and cracks
  • Works only for minor leaks
  • Discolors certain anti-freeze brands

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 Why Choose This: 

  • It mixes with all kinds of anti-freezes.
  • It does not require drainage or flushing
  • The nanotechnology microfibres are too small to cause any blockage in the circulatory system.
  • Ideal product for vehicle owners with little to no vehicle knowledge.

Bar’s Leaks Head Gasket Fix

Bar’s Leaks Head Gasket Fix - BEST HEAD GASKET SEALER

This sealer can be used by anyone, regardless of skill level. All you have to do now is pour it into your car’s radiator and fill it off with your preferred coolant.

Compatibility is not a concern because it can be used with any brand of antifreeze. You can drive your car again in 20 minutes. This sealant works well for repairing minor leaks and breaches.

Leaks from the Bar Sodium silicate and nanoparticles make up the 1111 sealer. These substances combine to form a bind with metals or polymers, effectively sealing leaks. The sealant hardens as the temperature of your engine rises. 

This product works well as a preventive. You’ll save time and money if the leaks haven’t progressed to a moderate or severe level.

With these kinds of leaks, it’s unlikely that you’ll need to apply it again. A single bottle can cure up to sixteen quarts of water. For the vast majority of automobiles, it’s more than enough.

For filthy systems, flushing is recommended, as it is with other Bar’s Leaks solutions. One disadvantage is that this sealant may clog your heater core if it has a partial blockage.

It’s also quite thick, making pouring it into the radiator a challenge. Furthermore, in many circumstances, it is only a temporary repair and not a long-term remedy.

Brand: ‎Bar’s Leaks
Model: ‎Block Seal Head Gasket Fix, 24 Oz
Item Weight: 1.5 pounds
Dimensions: 9.5 x 2.6 x 2.5 inches
Item Model No: 1111
Size: Pack of 1

Key Features
  • 24 ounces bottle capacity
  • Works within 20 minutes
  • 1 bottle treats 6 to 16-quart systems
  • Compatible with gasoline and diesel engines
  • Easy to use
  • Lasts for 1000s of miles
  • Used on vehicles that over-heat quickly
  • Treats early head issues
  • Mixes with all types of gasoline
  • Doesn’t applicable to ager breaches
  • Causes clog in dirty coolant systems

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 Why Choose This: 

  • It can be used on vehicles that overheat quickly.
  • It treats early head gasket issues.
  • It is easy to use and long-lasting.
  • It contains a mixture that is compatible with sodium silicate anti-freezes.

Steel Seal Head Gasket Sealer

Steel Seal Head Gasket Sealer - BEST HEAD GASKET SEALER

The Steel Seal gasket sealer is available in two bottles, which are sufficient for persons with larger engines, like eight-cylinder engines. The gadget comes with simple instructions, although it does require some automotive understanding to use.

White smoke, overheating of the engine, exterior leaks, and watery oil are all indicators of a blown head gasket, and this sealer is meant to fix them.

This gasket repair sealant is also acceptable for non-roadworthy automobiles. You can turn the engine off for 30 minutes if your car is in bad shape. Steel Seal does not function with all forms of antifreeze, as stated on the package. Still, for your convenience, there is a brief list of recommended antifreeze.

The mixture works to fill cracks and repair blown or shattered pieces during application. This isn’t only about the head gasket. It has the ability to repair heater cores as well as freeze plugs.

However, the company does not lead you to believe that it will work for all of its consumers. Instead, use a figure of roughly 95%.

Brand: ‎Steel Seal
Item Weight: 2.64 pounds
Dimensions: ‎4 x 4 x 8 inches
Manufacturer Part No: 8CYL001USA
Size: Pack of 2 bottles

Key Features
  • It ideal for 8 cylinder engine
  • 30-day return policy
  • Works within 30 minutes to 1 hour
  • Compatible with diesel and gasoline engines
  • 100% money-back guarantee
  • Clear instructions
  • Fast application
  • Doesn’t damage the coolant system
  • Money-back guarantee
  • Economical
  • Works for 95% of users
  • This may leave a buildup in the cooling system

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 Why Choose This: 

  • It is used to treat both, standard and serious symptoms.
  • It comes in 2 bottles with a $200 price for 160 pounds.
  • Replacement offered by the manufacturers of the product works in the first application and stops to do so in the next ones.
  • It is an award-winning product that comes with a triple-patented formula.

ATP Leak Stop 


ATP is included on the list because it is extremely compatible and simple to use for both amateur and professional technicians. It can be used as a head gasket sealer as well as a preventative measure against overheating.

The ATP also possesses plasticizer characteristics, which are chemicals used in rubber manufacture to control rubber’s flexibility and hardness. 

It’s also safe for internal bearings and non-toxic. There’s a reason why so many people endorse it. It’s not the most substantial entry in terms of volume, with 8 ounces (237 ml).

You won’t need to replace your oil either before or after using it. It won’t be necessary to flush out your cooling system—just add it to your car’s radiator. Of course, doing both of these things is ideal if your car is due for them.

ATP’s sealer will stop the leak as long as it isn’t too severe. The fact that this sealer does not require repeat applications is a significant plus. Once a leak is closed, it remains closed indefinitely.

The AT-205 is classified as a plasticizer by ATP; a chemical used in the rubber industry to set firmness and flexibility. There are numerous reviews that tout the re-success seal’s rate, therefore it must be reliable.

Brand: ‎ATP Automotive
Model: AT-205 Re-Seal
Item Weight: 1.76 ounces
Dimensions: 7 x 4.5 x 4 inches
Model No: AT-205

Key Features
  • 8 ounces bottle capacity
  • No need for draining or flushing
  • Long-lasting
  • Clears sludge
  • Compatible with all types of oils
  • Not over-priced
  • Doesn’t overswell leaks
  • Long-lasting
  • No need for draining or flushing
  • Compatible with all oil types
  • Lengthy treatment period
  • Doesn’t work on severe cracks

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 Why Choose This: 

  • It’s one bottle that fills 6 quarts of fluid.
  • It takes almost 5 hours to seal mild and moderate leaks.
  • It is a professional-grade application.
  • It deals with all issues of rubber seals and gaskets in engines.

Bar’s Leaks Head Seal Gasket

Bar’s Leaks Head Seal Gasket - BEST HEAD GASKET SEALER

The Bar’s Leak HG-1 is one of the most adaptable products on our list. It is simple to use and is claimed to be a long-term remedy.

This alone qualifies it as one of the most effective head gasket replacement options. That’s not all, though. This head gasket sealer is extremely adaptable, as it may be used on a wide range of engines.

It can be blended with any cooling system’s contents, including antifreeze and water. If you have existing obstructions or a dirty coolant system, this is an exception.

You’ll need to flush it first in this situation. Sodium silicate and carbon fiber particles make up this sealant. It also has a unique solution that prevents overheating while it circulates.

It’s highly adaptable and antifreeze compatible, and it doesn’t require a radiator flush. That saves a lot of time, and the maker claims that a repair may be done in as little as 45 minutes.

Some consumers have reported that plugging heater cores can be a problem, but the product is generally well-received.

Brand: Bar’s Leaks
Model: HG-1
Item Weight: 2.65 pounds
Dimensions: 9.78 x 3.22 x 3.22 inches
Size: Pack of 1
Exterior: Machined

Key Features
  • Bottle capacity 33.8 ounces
  • Works within 45 minutes
  • Mixes with all types of anti-freeze
  • Mixes with all types of water coolants
  • Compatible with gasoline and diesel engines
  • Effective on larger leaks
  • Suitable for bubbly radiators
  • Mild-moderate leaks are plugged for a long time
  • Works rapidly on overheated vehicles
  • Thick
  • Severe breaches may reopen

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 Why Choose This: 

  • It is also used to repair gasket leaks along with repairing blown heads.
  • It prevents heater, radiator, and core leaks.
  • It fixes leaking freeze and core plugs

Permatex Right Stuff Gasket 

Permatex Right Stuff Gasket - BEST HEAD GASKET SEALER

There’s no need to wait for the gasket makers to cure; simply reassemble and go! Pre-cut gaskets are less dependable and last longer than elastomeric formed-in-place material.

It resists blowout and prevents leaks and seepage due to vibration and thermal expansion. This material is used on OEM manufacturing lines and required in their service parts programs because it meets or exceeds quality standards for long-term sealing, durability, and handling. 

Continuous temperature range of -75°F to 450°F (-59°C to 232°C), intermittent temperature range of 500°F (260°C); resists ATF, coolant, oil, and other shop fluids.

It is sensor-safe. It is also fleet-tested. Pre-cut gaskets are less dependable and last longer.

Brand: Permatex
Model: Permatex 59-9193
Item Weight: 11.2 ounces
Dimensions: 2.19 x 2.19 x 10.06 inches
Model No: 85224
Size: Pack of 1
Exterior: Painted

Key Features
  • Flashpoint: 93.8889 degrees Celsius
  • Temperature Range: -75°F to 450°F
  • Specified in their service parts programs of OEM
  • Long-lasting application
  • Blowout resistant
  • Less amount is needed
  • Different price range
  • Comes in various sizes
  • Works on various auto parts
  • Can version is hard to apply
  • Not applicable on diesel engines

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 Why Choose This: 

  • It’s designed to meet or surpass long-term sealability performance criteria.
  • Suggested Applications include automotive, heavy-duty, and marine gaskets, valve covers, gearbox covers, pumps, oil pans, thermostat housings, and water pumps.
  • It eliminates the need for pre-formed, pre-cut, paper, rubber, or cork gaskets.

K&W Permanent Head Gasket

K&W Permanent Head Gasket - BEST HEAD GASKET SEALER

You’ll have the opportunity to fully clean your cooling system. Your coolant system will need to be drained and flushed multiple times. You’ll also be removing any blockages or clogs that may have formed during the procedure.

The instructions walk you through every step of the process from beginning to end. This product is quite effective, although it contains a chemical that is active. 

This could be dangerous to the user. As a result, always use caution when using it. You should also drain your cooling system and avoid combining it with antifreeze before applying it.

The nanoparticles can also withstand the extreme conditions found inside your engine. They’re made to stand up to high heat and pressure.  

The K&W nanotechnology sealer can be used on almost any vehicle, gasoline or diesel. The same may be said for engine size: it can run on four to eight cylinders.

Brand: K&W
Item Weight: 1.67 pounds
Dimensions: 4.394 x 8.610 x 24.206 cm
Type: Auto-accessory
Model No: 401232
Size: 32 Fluid Ounce
Warranty: 2 years

Key Features
  • Bottle capacity: 32 ounces.
  • Takes up to 15 hours to work.
  • Seals small breaches long-term.
  • Great for DIY mechanics.
  • Highly affordable for DIY-ers
  • Works on various automobiles
  • Seals cracks permanently
  • Cures early symptoms
  • One bottle is good for most vehicles
  • Not beginner-friendly
  • Misuse causes severe engine damage

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 Why Choose This: 

  • There is no need to worry about gasket blow-out as it seals the cracks permanently.
  • It is compatible with both gasoline and diesel engines.
  • It treats 4, 6, and 8-engine cylinders

Frequently Asked Questions (FAQ)

What is the cheapest way to fix a head gasket?
The cheapest way is to look for a gasket sealer. This will cut down your expense from thousands of dollars to a mere hundred dollars at the minimum.
Does the sealer clogs other clogs in the system?
Sealants are designed to clog holes in the head gasket, radiator, and leaks in hydraulic systems. However, larger cracks can’t be treated and the head gasket is to be replaced.
Are head gasket sealers safe for engines?
Good-quality head gasket sealers are designed to work effectively without damaging the vehicle’s engine. Most sealants work fine with gasoline, petrol, and diesel engines. They also work well with cast iron, aluminum, and plastic.

You may repair cracks and holes in the vehicle part on your own with the best power gasket sealant. If you’re doing it yourself, it’s critical to follow the instructions on the package. You can also count on an effective solution to your gasket problem when you have access to the best products on the market. 

Our top recommendation for the best overall permanent head gasket sealer is the Steel Seal Blown Head Gasket Fix Repair Sealer. It is suitable for automobiles, vans, SUVs, and trucks and works well on both old and new vehicles. This item is engine-friendly and manufactured by a reliable company. It can help you get rid of minor to serious symptoms and have your engine working smoothly again..!

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