One of the more common engine failures, particularly on vehicles with more than 80,000 miles on them, is head gasket failure. And head gasket failure can happen to any vehicle at any time. Although not all of these gaskets will fail in the same way, there are some tell-tale signs that your vehicle’s head gasket may be failing. These symptoms include oil or coolant leaks around the cylinder head, cylinder misfire, coolant-contaminated oil, spark plug misfire on startup, blue exhaust smoke, or even engine overheating. If any of these symptoms are occurring, then it might be time to fix the problem with a sealer. For our reader’s convenience, we’ve researched the ten best head gasket sealers available and listed them below.

Best Head Gasket Sealers – Reviews & Buying Guide

10Bar’s Leaks 1100 20-Ounce Block Seal

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Head gasket failures can be expensive to fix. In fact, the average cost for a garage to fit the vehicle with a new head gasket is anywhere from $2,000 to $3,000 at most shops. That’s the kind of money most people don’t have access to quickly, so that’s why this product is so popular. It can quickly seal head gaskets, so the vehicle owner has a little bit more time to get their car into a shop. Although it’s not a permanent solution, it will give the average consumer approximately a week or two of time, before they have to have their head gasket replaced.

Pros:

  • It’s an easy-to-use quick fix
  • Is inexpensive

Cons:

  • Isn’t a permanent solution

9Steel Seal Blown Head Gasket Repair

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Although we doubt that it’s the permanent fix that the bottle claims it is for a blown head gasket, it is a quick temporary fix that will buy the car owner sometime before they have to find another solution. This DIY product is easy-to-use and will temporarily stop the leaking on 8-cylinder engines. It’s pretty expensive for a fix of this type, but it does do a decent job at dealing with head gasket leaks, cracked heads or heater core leaks. All-in-all, it’s a decent product that can deal with some kind of head gasket leaks.

Pros:

  • Is a great temporary fix
  • It’s easy-to-use

Cons:

  • Its a pretty expensive product

8Permatex Indian Head Gasket Shellac Compound

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Of all of the quality sealants on this list, this one is probably the most cost-efficient. It cost many orders of magnitude than comparable head gasket sealing products. And it does a good job of sealing all common gaskets, too. When applied, it sets hard and resists diesel fuels and temperatures up to 350-degrees Fahrenheit. Although its applicator is way too large, which results in some pretty messy application, it’s otherwise a high-quality product ready to get the job of sealing gaskets done quickly and very efficiently.

Pros:

  • Product works well
  • It’s an inexpensive solution

Cons:

  • Applicator is large and messy

7K-Seal Pour-And-Go Head Gasket Fix

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For people to fully appreciate this product, they’re going to have to realize that it’s not going to fix a blown head gasket, only head gaskets that are leaking. Although it does say on the label that it’s a permanent fix, consumers should understand that it’s only a temporary one. Once that’s understood, however, consumers can see that this is a great product for its intended purpose. It’s a product designed to be a temporary fix for leaking head gaskets, blocks and heads. It’s also a product that’s easy-to-use and isn’t as messy as some other products can be.

Pros:

  • Works quickly
  • Is a great temporary solution

Cons:

  • Not a permanent fix

6Blue Devil Head Gasket Sealer

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Although this product won’t work with all head gasket problems, particularly ones involving blown heads, it does do a good job for gaskets that have begun to leak. This product is easy-to-use and can be used on freeze plugs, heater cores, cracked heads, and warped heads. It’s also good for heads that are leaking but haven’t completely failed yet. It’s a solution that many people can use to good effect to keep their car running until it can be taken to a shop.

Pros:

  • Works well for warped heads & freeze plugs
  • It’s an easy-to-use product

Cons:

  • Won’t fix all gasket leaks

5Bar’s Leaks 1111 Block Seal Gasket Fix

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Even though this gasket fix isn’t the miracle solution that some people hope it would be, it does do a good job of dealing with most minor coolant leaks due to cracked blocks or cylinder heads. Although it won’t fix blown head gaskets, it will effectively stop head gasket leaks. And it’s as easy to use as pouring it into the radiator and allowing it to do its job. It’s also a product that isn’t too expensive and will buy the vehicle owner some time before they have to take their car to the shop.

Pros:

  • Is an easy-to-use product
  • Quickly stops coolant leaks

Cons:

  • Won’t work on all sealant leaks

4Permatex Copper Spray Adhesive Sealant

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Although this head gasket sealer won’t seal gaskets that have significant gaps to fill, it will handle most minor gasket leaks. That makes this a good product for sealing cylinder head gaskets and exhaust manifold gaskets. It works particularly well for rebuilds where the mechanic is using this product to help seal a new gasket they’re installing. This product is also fast-drying and helps to improve heat transfer and dissipation around the gasket. It’s not a permanent quick-fix product, but it does do a great job of sealing gasket leaks.

Pros:

  • Great product to use with a gasket for rebuilds
  • Is an inexpensive product

Cons:

  • Won’t seal larger gaps

3J-B Weld Ultimate Gasket Maker & Sealant

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J-B Weld is a company known for making some of the best adhesives in the world, so it shouldn’t surprise anyone that they also make one of the best head gasket sealers available. It’s made from a silicone material that goes on easily and performs an almost indestructible layer. That’s probably why it’s been used by DIY enthusiasts, mechanics and automotive professions who understand a quality product. It’s also a product that’s not only suitable for head gaskets but also water pumps, timing covers, exhaust manifolds, and other automotive applications.

Pros:

  • Its easy-to-use
  • It’s great for sealing and making gaskets

Cons:

  • Nozzle tends to clog

2Permatex High-Tack Gasket Sealant

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This high-tack gasket sealant is suitable for a variety of different applications and not just for sealing minor gasket leaks. It can also be used to seal cut gaskets and holding them into place during installation. It’s a product that resists all kind of automotive and household chemicals including kerosene, butane, gasoline, oil, antifreeze or axle lube. Although it’s extremely tacky and can be messy to use, it’s a high-quality product that many DIY enthusiasts or mechanics is going to love.

Pros:

  • Works extremely well
  • Good for use as a gasket tack or sealant

Cons:

  • Can be messy to work with

1ATP AT-205 Re-Seal Leak Stop

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This quality head gasket sealer has quite a few things going for it. It’s not only easy to apply, but it also seals most minor leaks. That makes it a great product for use not only on head gaskets but also on gaskets for transmissions, power steering units, and hydraulic systems. It’s also good for sealing the gaskets on differentials as well. This product is made without petroleum distillates, so it won’t breakdown seals over time. Overall, it’s just a great product that does a good job of sealing gaskets of all kinds, particularly head gaskets.

Pros:

  • Is easy to apply
  • It works great
  • It doesn’t cost a whole lot

Cons:

  • Not designed for severe leaks

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