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What Are the Top 10 Best Head Gasket Sealers? – 2021 Reviews

When you’re looking for a great head gasket sealer for your car, all of the offerings can start to look the same. It’s unclear to you whether you should pick up a head gasket sealer which is pour-on, in tablet format, or some newfangled spray-on concoction.

In this article, we’ll help you out by rounding up the top ten best head gasket sealers on the market in 2021. By the time you’re done reading, you’ll know precisely which head gasket sealer is right for your needs.

Let’s jump right in and take a look at the list!

BlueDevil Pour-N-Go Head Gasket Sealer

The BlueDevil Pour-N-Go Head Gasket Sealer is great for four or six-cylinder engines because it will help to permanently seal blown or cracked head gaskets. For this head gasket sealer, you can expect to patch up some serious damage to your vehicle.

There are even a few reports of people using the BlueDevil offering to seal up external leaks in their radiator. That’s right; this head gasket sealer isn’t confined to head gaskets. Any kind of fluid system leak is eligible, even if it may not be the optimal tool.

Genuine GM Fluid Cooling System Seal Tablet

The Genuine GM (12378255) Fluid 3634621 Cooling System Seal Tablet is one of the best head gasket sealers because it comes in a unique format that is designed for your cooling system.

These tablets are non-toxic and easy to apply. Consult the chart on the back of the package to compare the volume of your cooling system with the number of tablets that you’ll need to utilize to cool it. Each tablet is four grams, which means you should expect to use only one tablet.

Though the system is designed for automotive use, if you have another engine or mechanical component which has a cooling system that is out of order, you can probably patch it up using these tablets. Be sure to read the instructions if you’re not familiar with how to use these tablet-based systems.

BlueDevil Head Gasket Sealer

The BlueDevil Head Gasket Sealer is another offering from Blue Devil which you’ll find perfect for your car. Unlike its sister product, this head gasket sealer contains no solid particulates within the fluid.

This has a couple of benefits but also a couple of drawbacks. First, with this head gasket sealer, you’ll need to let the treatment seep in for a few hours before starting the engine to confirm that the repair was successful.

Nonetheless, this head gasket sealer offers the prospect of permanent repair for your engine’s woes. It also is very easy to use — pour it on the problem area, and wait.

ATP AT-205 Re-Seal

The ATP AT-205 Re-Seal is a notable entry in the head gasket sealer market because it addresses multiple issues in your car’s mechanical systems. This sealer can help cracked rubber seals, gaskets, and even other trouble areas like the transmission.

If you have trouble with your power steering system, you might also want to consider using this head gasket sealer. Luckily, this product is also compatible with all sorts of other engine repairing chemicals, so you’ll never need to worry about contradictory reactions.

This feature is especially important if you are finding gasoline or engine oil leaking from your car and accumulating at the bottom of the fuselage. These chemicals are solvents, which means that they will typically dissolve all sorts of sealant products — but not the ATP AT-205.

K&W 401232 Permanent Head Gasket & Block Repair with Nanotechnology

The K&W 401232 Permanent Head Gasket & Block Repair with Nanotechnology is a cutting-edge head gasket sealer which uses nanotechnology to bond hard surface areas and improves their tensile strength as well as their load-bearing capacity.

You may not think that these properties are important for your gaskets, but in fact, it’s critical. Gaskets are responsible for withstanding pressure, which is essentially a kind of load which can apply force in the opposite direction of typical loads.

This means that the K&W head gasket sealer is superior to the competition in terms of the repair quality. It’s a bit more expensive as a result.

BlueDevil 32oz Head Gasket Sealer with Radiator Flush

The BlueDevil 32oz Head Gasket Sealer with Radiator Flush is yet another great offering from the industry leader Blue Devil. Unlike its sister products, this head gasket sealer is radiator-friendly.

The flush aspect of the product is intended to make it the ideal solution to any radiator issues. Whether your radiator drips incessantly or lets off a bit too much steam to remain energy efficient, you can solve the issue by pouring in a bit of the Blue Devil flush.

You’ll find that any kind of leaking radiator will be easy to fix when you use this. The flush is also great for fixing up warped and cracked head gaskets, which is another unique feature not many other head gasket sealers have.

Steel Seal Blown Head Gasket Fix Repair Sealer – 8 Cylinder

The Steel Seal Blown Head Gasket Fix Repair Sealer – 8 Cylinder is a product optimized for eight-cylinder engines which may also be suitable for six-cylinder engines.

This product has the distinction of being backed by a warranty which claims to fully refund your costs in the event that you are not satisfied with its performance. You won’t need it when you use the Steel Seal sealant, however.

Assuming you’re following the instructions and applying it to the blown head gasket on your car’s eight-cylinder engine, the Steel Seal sealant is as effective as re-welding the system yourself.

The product doesn’t contain steel, but you won’t be able to tell the difference when you apply it. The best part is that it is optimized specifically for the kind of engine your car has. High-performance engines need high-performance head gasket sealants that can keep up.

Bar’s Leaks 1109 Block Seal Liquid Copper Intake and Radiator Stop Leak

The Bar’s Leaks 1109 Block Seal Liquid Copper Intake and Radiator Stop Leak is a very easy to use radiator and blown head gasket repair product. To apply the Bar’s Leaks formula, pour the solution directly into your radiator. That’s it.

The best part about the Bar’s Leaks formula is that it’s only one step. You don’t need to wait very long after applying it before you can check the system for any remaining problems. You can start the car and take off right away.

This product is for more than radiators and blown head gaskets, however. You can also use it to plug freezing fluid leaks or repair blocks.

When using this product, you will need to wear the proper protective equipment. Gloves will be sufficient, and goggles are highly recommended. The product contains copper, which is not intrinsically bad for you, but it may irritate your skin.

Copper will also do a number on your eyes, so be sure to wear goggles. This product uses copper because it has the best sealant properties of all of the sealant chemicals — but it comes with these caveats as a result.

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

The Permatex 80697 Copper Spray-A-Gasket Hi-Temp Adhesive Sealant is unique among the head gasket sealants on this list because it’s spray-on.

The spray-on functionality of this head gasket sealer means that it can address issues that the other head gasket sealers can’t. You can also fortify scarred areas or surface irregularities which might become a problem for your car in the future if left unaddressed.

The utility is obvious: you only need one product to repair many different parts of your engine and coolant system.

Nonetheless, you should take care when you use this spray. The spray is based on copper that has been aerosolized, which is very effective for sealing cracks that you can see, but is also very bad for your lungs. Wear a mask and gloves when you apply this product and you’ll be all set.

K-Seal ST5516 HD Multi Purpose One Step Permanent Coolant Leak Repair

The K-Seal ST5516 HD Multi Purpose One Step Permanent Coolant Leak Repair is easy to use, perfect for coolant systems, and ready for your car right out of the box. Shake up the mixture and pour it in. You don’t need to drain or flush the product out — start the car and head on your way.

This product can also address problems with your cylinder heads, water pump casing, and engine block — areas that few other head gasket sealants can claim to address.

Interestingly, part of this product’s value proposition is its extensive instruction manual. Rather than merely sending you off on your own with the instructions on the back of the container, this product comes with an excellent PDF guide describing problems with your engine and how to apply the sealant to fix it optimally.

Furthermore, you’ll get a number of protocols to test your repairs and make sure that your car is healthy once you’re done.