Top 10 Best Head Gasket Sealers in 2021 | Mechanic’s Best Choices!

In today’s modern world, almost every one of us has our own vehicle as the transportation to school, work or other places in the city. However, to make sure that your vehicle’s engine is maintained properly, we have to ensure that the head gasket is in good condition to prevent the engine from breaking down. By using the head gasket sealer, it minimizes the chances that the head gasket will leak at any unexpected time.

Nevertheless, if you are not sure about how to choose the right sealer for vehicle’s head gasket, just follow along with us. We will introduce you to the top ten best head gasket sealers that you can get at a reasonable price. Also, we will provide the key feature and buying guide as well to help you with the shopping experience.

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List of the 10 Best Head Gasket Sealers in 2021

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10. Bar’s Leaks HG-1 HEAD SEAL Blown Head Gasket Repair

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First of all, you shall take a look at this head gasket sealer from Bar’s Leaks. It is able to repair the gasket head that has been blown and intake the leaks from the gasket. Also, it works well to repair cracked or broken cylinder heads to be sealed once again. More importantly, it can make the overheat or coolant core work again without further leaking. With this head gasket’s sealer, users do not have to spend thousands of dollars to repair the head gasket. It is also compatible for antifreeze. In addition, for the cooling system, it can prevent the bubble from entering inside and ruin the system.

Key Features:

  • Stop gasket leaks and restore blown head
  • Fasten cracked head or blocks
  • Prevent loss from overheating or coolant
  • Secure the cooling system against bubble

9. BlueDevil Head Gasket Sealer

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Next, we have this head gasket sealer from BlueDevil Products. This sealer is designed ideally for a wide range of applications. First of all, it can make repairs to the blown gasket head and restore its original condition. Next, it repairs the warped heads to work well again. Then, it prevents leaks from both heating cores and freeze plugs. Inside the bottle, it is 100′ guaranteed that it will not contain any particulate matter that is harmful to the engine of the vehicle. It works as a great solution in case your engine parts are needed to be repaired. It is safe to use, and the operating process is easy and simple. It comes with the volume of 2lbs for your engine use.

Key Features:

  • Exclude solid chemicals and PM
  • Safe for engine use
  • repair blown and cracked head
  • Secure the gasket core against leakage.

8. K-SEAL Ultimate Permanent Head Gasket

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Moving onto the next head gasket sealer from KALIMEX LTD, it is there to serve your head gasket permanently. The operation process is very easy because users only have to pure the liquid in, and then they are ready to go. It is able to fix all types of blown or cracked head gaskets without having to replace it. Furthermore, the kit has been tested to be safe by Brighton University, and it is certified to meet the standard requirements of ASTM D3147 for safety.

However, if you find that it cannot stop the leakage, it is recommended for you to check the pressure because you might over pressurize the product. For technical problems, there is a guidance booklet to tell you about the instructions and any problems you can encounter with solutions provided.

Key Features:

  • Operation: pure and go
  • Repair cracked head gaskets
  • Tested by Brighton University and certified by ASTM D3147
  • Weight: 1 pound

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

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Here comes another bottle of head gasket’s sealer from Bar’s Leaks. It comes with a bottle of 24oz, and it is ready to fix the head gasket of the engine of your vehicle. It is there to block the leakage from your head gasket. Thanks to this sealer, your cylinder heads as well as blocks are sealed once again even after cracking or warping. Inside the bottle, it contains the antifreeze materials to make sure that the liquid can be sealed by the sodium silicate once again. It also prevents the particles inside the gasket from leaking. This way, your head gasket is sealed permanently to stop leaking. Last but not least, it includes the instruction guide for you to learn about how to operate and any technical problems and solutions.

Key Features:

  • Volume: 24oz
  • Seal blown and cracked head gasket and blocks
  • Stop the freeze inside the core
  • Instruction guide included for technical issues and operation

6. BlueDevil Pour-N-Go Head Gasket Sealer

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Now, we have another model of head gasket sealer from BlueDevil Products. It comes with a formula that encourages users to repair the head gasket part of their engine on their own. The operation is very easy, which requires users to pour the liquid in in order to be ready to go. In addition, it is suitable for 4 cylinder engines or what we know as v6.

More importantly, it provides a permanent repair for your engine to run through another hundreds or even thousands of miles. It is made in the US, and it comes with a volume of 15oz or 473ml. It can be used for quite a long period of time until you have to purchase another bottle for use. With a reasonable price, it offers almost lifetime warranty to ensure you with the best customer satisfaction.

Key Features:

  • Compatible with 4 cylinder and v6 engine
  • Made and assembled in USA
  • Bottle size: 15oz or 473ml

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

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We would like to recommend you to this head gasket sealer from K&W. It is made of the most outstanding formula that can fix your leakage problem in just minutes. Thus, users can pour the liquid in and be ready to go ahead with the vehicle. It is there to fix your head gasket in case of leakage or blocking problems. Moreover, if the cooling system encounters any blocks, it is also there to repair.

It uses 3 advanced technologies, which are military strength fibers for fixing multiple layers cracking, nanotechnology for small cracks and Cool-X conditioner to reduce operating temperature. Therefore, it will give you a smooth and efficient vehicle operation again without having to spend thousands of dollars on changing the head gasket. Last but not least, it is compatible with all types of antifreeze as well as plain water.

Key Features:

  • Operation: pour and go process
  • Technology: (1) military strength fiber, (2) nanotechnology and (3) Cool-X conditioner
  • Suitable for anti-freeze water
  • Repair blown head gasket

4. STEEL SEAL Head Gasket Sealer for 6 Cylinder Engines

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STEEL SEAL also offers us one of the best head gasket sealers that we can get on the market. If your head gasket in the engine is facing leaking problems, it is there to seal to stop the leakage. Users can fix the problem on their own easily with the use of this bottle of sealer. Users only have to pour the liquid in the seal quickly. With the most advanced formula, it has been awarded and recommended by many users.

This head gasket’s sealer is suitable for all types of 6 cylinder engines. For such an engine, it requires 2 bottles to pour in each time. However, if you find out that the quality of the product does not match with the description or your expectation, you can claim your money back from the manufacturer to guarantee you with the best shopping experience.

Key Features:

  • Stop head gasket leakage forever
  • Process: pour and ready to go
  • Awarded for the patent of the formula
  • Compatible with 6-cylinder engine
  • Money back warranty

3. BlueDevil 32oz Head Gasket Sealer w/Radiator Flush

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Let us take a look at another sealer for head gasket from Blue Devil Products. It is there to serve you in case you have blown or cracked head gaskets. You can use this to seal the head and prevent it from leaking. More importantly, users can use it to seal the heater cores from leaking and overheating as well.

The bottle comes with the volume of 32oz. In case your engine gets interrupted by the problems caused by the head gasket, this is to restore the performance of the engine, which helps users a lot and saves them a lot of money as well from having to replace a new head gasket system. For these reasons, you should choose this sealer to maximize the performance of your own engine.

Key Features:

  • Capacity: 32oz
  • Repair or fix blown head gasket
  • Prevent both heating and freezing cores from leaking
  • Safe for engine use

2. Permatex 80697 Copper Spray-A-Gasket Hi-Temp Adhesive Sealant

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Then, we also have this head gasket’s sealer from Permatex. It is available for you at an affordable price with 9 ounces of liquid inside the bottle. It features a fast drying process which you can use for dissipating heat, securing the gasket against burnout and enhancing the heat transfer process. In case the surface functions irregularly, it also fills it with hot spots and minor imperfections.

It is suitable for all kinds and brands of automotive fluids, including gasoline. The ideal operating temperature ranges between -50 and 500 degrees Fahrenheit or -45 – 260 degrees Celsius. Last but not least, the suggested applications of this product include the head gasket of a cylinder, exhaust from manifold gasket as well as other applications operating in high temperature.

Key Features:

  • Fast dry by using the spray form
  • Temperature: -50 – 500°F or -45 – 260°C
  • Applications: exhaust manifold and cylinder gasket.
  • Compatible with all automotive fluids.

1. STEEL SEAL Blown Head Gasket Fix Repair Sealer – 8 Cylinder

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Last but not least, we would like to introduce you to this head gasket sealer from STEEL SEAL. It comes with 2 bottles inside the package, and it is suitable for an 8 cylinder engine. For the operation of this sealer, users can do it by themselves with simply pouring in to get the immediate result. This bottle of sealer is highly recommended by the customers because it is also used by hundreds and thousands of repairmen worldwide.

The quality of the product is guaranteed to be the best for you because in case you are not satisfied with the quality, you can claim your money back from the manufacturer. It is there to provide you with the best experience in fixing the broken head gaskets of your engine for you.

Key Features:

  • 2 bottle set
  • Compatible with 8-cylinder engine
  • Do it yourself operation process
  • Money back warrant from the manufacturer
  • Formula from award winning team

What Makes the Best Head Gasket Sealers?

If you are not satisfied with your shirt, you can throw it away and buy a new one. However, when it comes to a head gasket sealer, the experience is completely different. If you pour in the bad quality sealers, you might have to replace the whole system to get everything to work well again. Hence, to make sure that you will not get such a bad experience, follow along with us in this buying guide section.


You should make sure that it can be used with a wide range of applications. These include fixing blown head gaskets, sealing or repairing cracked heads or blocks and fixing heaters and coolant. By fixing, it means to stop the oil leakage to prevent the loss of the power of the machine.


To do it by yourself, the operation should be as easy as pouring in and waiting for the result. Otherwise, you might need help from the professionals.


Before purchasing, you have to look at how many cylinders your vehicle contains. This way, you can get to know how much head gasket sealer you need to pour in in order to repair or fix the problems.


To sum up for this article, we have toured you through the top ten best gasket healers. Now, you should have made up your mind in choosing the right head gasket sealer for your vehicle to work smoothly and efficiently. Thank you for shopping with us.

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