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Top 6 Best Head Gasket Sealers in 2021 Review & Buying Guide

One of the scariest things a car owner may experience is a head gasket blowing up. This quickly leads to a slew of other problems like coolant mixing into the engine oil and might even lead to the engine misfiring.

Once your head gasket blows, you really only have two options. Either you replace the head gasket or use a head gasket sealer. The first option could be difficult, especially if you are out in the middle of nowhere. Towing services are expensive, as well as the cost of replacing the head gasket.

Is there a better option?

Keeping a reliable bottle of head gasket sealer in your car at all times is an easier and more affordable option. That said, with so many different variants on the market, it can be tough to know which brand to rely on when in need. This is why we decided to review the best head gasket sealer options currently available, so you don’t have to spend countless hours searching for the best product for you.

So, let’s take a look at them, starting with our…

Best Head Gasket Sealer

Top 6 Best Head Gasket Sealers on the Market in 2021 Reviews

ProductsFeaturesRating
Features
15-minute set time.
Works with diesel and gasoline.
No flushing required.
4.2 out of 5 stars (4.2 / 5)
Features
Versatile.
Easy to use.
Plasticizer will rejuvenate all rubber seals.
No petroleum distillates.
4.4 out of 5 stars (4.4 / 5)
Features
Nanotechnology with microfiber mesh.
Works within 3 minutes.
Great for small leaks and cracks.
4.2 out of 5 stars (4.2 / 5)
Features
Easy, spray on nature.
Quick dry time.
Versatile.
4.7 out of 5 stars (4.7 / 5)
Features
Replaces blown gaskets.
Quick to work.
Withstands high and low temperatures.
4.6 out of 5 stars (4.6 / 5)
Features
Replaces blown gaskets.
Quick to work.
Withstands high and low temperatures.
Used on imported cars.
4.6 out of 5 stars (4.6 / 5)

1 Bar’s Leaks Block Seal Permanent Head Gasket Fix – Best Mid Range Head Gasket Sealer

Bar’s Leaks permanent head gasket fix is by far the best option on the market currently. With this bottle in your vehicle, you will never fear blowing a gasket ever again.

Bar’s Leak has been in the market since 1947, producing award-winning stop leak products that compare to non-other in quality and performance. They are a U.S.-based company and have manufactured over two million bottles of this head gasket fix since it was launched in 2004.

The best part about this gasket sealer?

The fact that it only requires 15 minutes before you are off on the road again. This makes it one of the Fastest Head Gasket Sealers in our review. Bar’s Leaks also come with a 100% money-back guarantee, which shows they have complete faith in their own product.

The sealant is made of a strong sodium silicate which will set and become hard like glass after applied. The mixture is also compatible with antifreeze, which means you do not have to flush the system, and will permanently fix any leakages in your head gasket, making it the perfect permanent fix. It is also compatible with all gasoline and diesel engines, making it versatile.


Bar’s Leaks Block Seal Permanent Head Gasket Fix

Our rating:4.2 out of 5 stars (4.2 / 5)

Pros

  • 15-minute set time.
  • Works with diesel and gasoline.
  • No flushing required.

Cons

  • None.

2 ATP AT-205 Re-Seal Stops Leaks – Best Rated Head Gasket Sealer

Any leakages on your head gasket or surrounding rubbers need to be addressed quickly before they become larger problems, which is where ATP’s re-seal stop leak comes in. This is a product that every mechanic keeps nearby at all times.

It successfully stops any leaks and seals them off permanently. No more worries about the gasket blowing or old seals that are worn out when you have this bottle on your shelf.

What can it be used for?

This stop leak can be used for a plethora of leaks, including hydraulic, power steering, and transmission systems. It can be mixed with any synthetic oils that are used in all these systems, making it a very versatile product that can be used to stop any leak. The best part is that not only does it seal any leaks, but it will also fix and rejuvenate old rubber seals, prolonging the lifespan of all the rubbers in the system.

This product is a plasticizer, which means it will be able to fix small leaks caused by wear and tear of the rubber seals in the system, but won’t be able to fix larger tears or leaks. However, it can take up to five hours for the product to work.


ATP AT-205 Re-Seal Stops Leaks

Our rating:4.4 out of 5 stars (4.4 / 5)

Pros

  • Versatile.
  • Easy to use.
  • Plasticizer will rejuvenate all rubber seals.
  • No petroleum distillates.

Cons

  • Five hours to work effectively.

3 K-Seal ST5501 Multi-Purpose One Step Permanent Coolant Leak Repair – Best Value Head Gasket Sealer for the Money

K-Seal’s Multi-Purpose one-step gasket sealer is not only super easy to use but also comes at a super low cost making it an affordable option. This shake, pour and go solution is as simple as that.

Not only is it that easy to use, but it is also compatible with antifreeze, which means you won’t need to flush the system before adding the product, making it the perfect solution for on the road problems. This is a multipurpose sealant, which means it won’t just fix blown head gaskets, but will also work for other leakages on the engine block, water pumps, and heater core.

What makes it special?

The sealant is made using nanotechnology. These microfibers mesh together over cracks and tears, which may cause leakages, permanently sealing the areas.

This sealant works extremely fast, and results can be seen within three minutes of adding the mixture to the system. It is important to note that this sealant works great for small tears and cracks but won’t be able to seal any major leaks.


K-Seal ST5501 Multi-Purpose One Step Permanent Coolant Leak Repair

Our rating:4.2 out of 5 stars (4.2 / 5)

Pros

  • Nanotechnology with microfiber mesh.
  • Starts to work within three minutes.
  • Great for small leaks and cracks.

Cons

  • Only for smaller fixes.

4 Permatex 80064 High Tack Spray-A-Gasket Sealant – Best Budget Head Gasket Sealer

Permatex’s Spray-A-Gasket sealant is an excellent, multipurpose, fast-drying sealant that can withstand high temperatures up to 500 degrees Fahrenheit as well as low temperatures of up to -65 degrees Fahrenheit.

The product is a mixture of resin and elastomers, which is then applied to the gasket’s surface. This silicone-made adhesive will then bond and create a robust surface that will not be able to be penetrated by gasoline, antifreeze, or oils.

Simple all round…

Following the instructions is easy, and so is application. After applying the spray, it will start setting within five minutes, making a great, quick-fix solution.

The versatile nature of the spray is what makes it a great option since it can be used on gaskets, carburetors, hose connections, and valve connections, as well as many other places.


Permatex 80064 High Tack Spray-A-Gasket Sealant

Our rating:4.7 out of 5 stars (4.7 / 5)

Pros

  • Easy, spray-on nature.
  • Quick dry time.
  • Versatile.

Cons

  • None.

5 Permatex 85224 The Right Stuff Gasket Maker – Most Durable Head Gasket Sealer

The second Permatex product in our review has been made specifically for use on gaskets. This sealant created an elastomeric rubber which will quickly and thoroughly seal any leaks and cracks you from a blown head gasket.

It is extremely durable and should always be kept in your vehicle for emergency situations. It can be used on all gaskets, including cork, paper, and pre-formed gaskets.

What did we absolutely love about it?

The sealant is so strong that it is blowout proof, which means it can replace a broken gasket with ease, allowing you to get your vehicle to a mechanic without any issues to replace the blown gasket.

This gasket maker can withstand high and low temperatures of 450 degrees Fahrenheit to -75 degrees Fahrenheit.


Permatex 85224 The Right Stuff Gasket Maker

Our rating:4.6 out of 5 stars (4.6 / 5)

Pros

  • Replaces blown gaskets.
  • Quick to work.
  • Withstands high and low temperatures.

Cons

  • None.

6 Permatex 34311 The Right Stuff Grey Gasket Maker – Best Premium Head Gasket Sealer

Permatex’s Grey gasket maker is similar to the original Right Stuff gasket maker, but this has been designed for use with import vehicles. These have bolt patterns that are spaced much closer to each other, as well as engines that are usually used with higher torque loads.

This requires a stronger adhesive to prevent blowout because there is more pressure and heat put on the gaskets. Similar to the original product, this gasket maker works fast and creates a durable gasket head with ease. The elastomeric rubber that is formed is an excellent quick fix for blown gaskets unlike any other.


Permatex 34311 The Right Stuff Grey Gasket Maker

Our rating:4.6 out of 5 stars (4.6 / 5)

Pros

  • Replaces blown gaskets.
  • Quick to work.
  • Withstands high and low temperatures.
  • Used for exotic, imported cars.

Cons

  • None.

Best Head Gasket Sealer Buying Guide

Best Head Gasket Sealer Buying Guide

What are head gasket sealers?

Head gasket sealers can be found in various forms, including glues, sprays, and pastes. These adhesive materials as used to seal or replace broken, cracked, leaking, and blown gaskets. A blown gasket can leak oil, water, and gas, which can lead to dangerous or costly situations, which is why sealing up a blown gasket is of the utmost importance.

Replacing a head gasket can become a costly endeavor, which is why many people turn towards gasket sealers. It is important to note that most of these sealants are used to fix minor leaks and cracks and are not capable of repairing large leakages.

There are a few different types of gasket sealers, so let’s quickly take a look at them…

Multipurpose leak sealants

These sealants are great to use for any small leaks on your vehicle. This does not only include the head gasket but can be for a multitude of things like the cooling system, carburetor, and hydraulic systems.

These are handy products to always have on hand in your vehicle. It should be noted that these might not be useful if your head gasket is completely broken, but can fix smaller, minor cracks and leaks instead of replacing it.

Gasket makers

These products are used only for blown out gaskets. They are used to completely replace a blown gasket using an elastomeric rubber that covers the area. This adhesive glue is great if you are on the road and suffer a blown gasket.

Although they easily seal up the whole gasket, we do recommend that you still replace the gasket as soon as possible, since these gasket makers are used to seal up larger damaged gaskets.

Spray-on sealant

These spray-on sealants are great for reinforcing rubber seals and areas surrounding valves where you would like to make sure it does not leak. Not only that, but they can be used on areas where some leakage might occur due to old rubber seals or small cracks and tears. These are usually quick to work, but are the least reliable and should only be used for very small leaks.

Which other car care products do we recommend?

Check out our comprehensive reviews of the Best Detailing Spray, the Best Bug Deflectors, the Best Radiator Stop Leak, the Best Dashboard Cleaners For Cars, and the Best Carburetor Cleaners you can buy in 2021.

But don’t stop there! We know you want to take the best care of your car possible. So be sure to check out our reviews of the Best Car Jump Starters, the Best Car Upholstery Cleaners, the Best Headlight Restoration Kit, the Best Engine Degreaser, and the Best 0W-20 Synthetic Oils currently on the market.

Which is the Best Head Gasket Sealer?

Well, in our opinion, it has to be the…

Bar’s Leaks Block Seal Permanent Head Gasket Fix

It is not only an affordable solution to a blown gasket but permanently seals any leaks or cracks quickly within 15-minutes. Keeping a bottle on hand is recommended at all times in case of emergencies. You won’t catch us without a bottle in our car anytime soon.

Happy motoring.

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