Best Head Gasket Stop Leak

Best Head Gasket Stop Leak. Head gaskets are a critical component for the safety of an engine. They act as crucial seals to prevent leaks in high pressure situations. However, when it fails, repairing head gasket damage can be pricey due to very expensive tools and highly specialized mechanics needed for the job.

On the other hand, a more economical solution is to use sealer on your head gasket. Sealers are form-fill-seal foam compositions that solidify upon being exposed to air, creating a large amount of foam fill in a small amount of time and filling machined surfaces with strong effective materials.

With such little time needed before sealing and with significantly less cost than you’d expect, sealers are the best way to avoid considerable downtime while still preventing leakage and damage at once.

7 Best Head Gasket Stop Leak

1. BlueDevil Head Gasket Sealerbluedevil head gasket sealer

BlueDevil Head Gasket Sealer uses a special formula that features a high-grade cross linked polymer resin formulation and an asphalt base, which is designed to repair cracks in all types of internal combustion engine block castings.

Ideal for use in gasoline- and diesel-powered engines, BlueDevil’s clear formula makes it easy to see when it has completely dried after application.

It won’t clog or harm your engine and will bond with metal, aluminum alloy, cast or plastic! For less than $10 you can purchase this versatile products and use them as both radiator sealant and engine coolant.

The product is one of the few sealants that actually seals leaks permanently on its own. That makes it a more cost-effective choice because you’ll be able to avoid costly repairs like replacing faulty components. This BlueDevil engine and cooling leak sealant comes in an easy-to-apply liquid form.

Once it’s applied, it forms a chemical weld over leaking gaskets, radiators, heater cores, freeze plugs and other ignition sources within your vehicle’s engine.

The adhesive will last forever, providing years or even decades of leak protection without having to apply anymore sealant once initial application is done.

2. K-Seal ST5501 Multi Purpose One Stepk seal st5501 multi purpose one step

This K-Seal head gasket set is a three-in-one solution. This means that this concoction has the ability to fix and seal two issues with your vehicle’s engine at once, including coolant leaks and cracked head gaskets.

This coolant repair will work on the block or cylinder head where it ruptures through small cracks, then creates a seal with the coolant particles in order to completely stop leaks.

It’s an easy fix that can save you time by allowing you to mix this product into your radiator while it’s still attached to your car.

When you see damage, just shake out a little bit of this product into the affected area and then top off with water. The rich repair sealant will build up inside the system to help prevent leaks from forming because it protects it from rust and corrosion.

In addition, the sealant will stop other cracks from getting worse over time which is why it’s so effective for repairing damage on a wide variety of components that have seen better days like engine blocks, cylinder heads, heater cores, water pumps, freeze plugs and radiator hoses as well as head gaskets.

3. AT-205 Seal Leak Stopper 8 Ounceat 205 seal leak stopper 8 ounce

This gasket sealer from ATP is fast-acting, stops your leak almost instantly – but is also specially designed and ideal for countless other applications around the home.

As you pour this chemical over the damage site – you’ll immediately notice that the fluid not only stops your leak but can rejuvenate virtually all rubber seals and gaskets.

Even power steering hydraulic systems will be restored to their former glory! One of the best things about this versatile sealant formula is that it works with both conventional and synthetic oils, as well as many types of transmission oils!

This chemical won’t harm any engine or cause any unnecessary swelling of gaskets within your car’s engine compartment.  It can also be used in any weather conditions.

The recommended dosage for one bottle of this hydraulic fluid is between 8 to 6 ounces per six quart of the engine. This can be easily adjusted to fit your machinery’s need.

4. K&W 401232 Permanent Head Gasketk&w 401232 permanent head gasket

This gasket head and block repair is a great, powerful formula to treat engine damages and get your system up and running in no time. Some nanotechnology products can be dangerous or unsafe to use, but that’s not the case with this particular gasket head repair.

The unique nature of this product, including the fact that it’s completely safe and doesn’t cause harm to surrounding areas or other parts of the engine, makes it incredibly popular among consumers. This formula can seal leaks quickly and effectively due to the way it flows around cracks in damaged areas.

Not only does this gasket head repair work on various parts of engines to fix problems; you can also use it on buses or even vehicles such as sedans. This gasket compound is unlike other products on the market because it’s ingenious formula has 3-organic components that dissolve engine leaks quickly, precisely and effectively.

Using nanotechnology with a dissolvable powder to clean fuel injectors and repair faults, this product works twice as fast as conventional sealants and trays as well. We know you’ll be impressed with what our gasket compound is capable of. And that’s not all!

5. Steel Seal Blown Head Gasket Fix steel seal blown head gasket fix 

There are several options for sealing products to fix your blown head gasket, but one that I’ve had success with is the Steel Seal Blown Head Gasket Fix Repair Sealer.

And honestly, regardless of whether you’re driving a gas or diesel engine model, this stuff works amazingly well at delivering a fast and easy way to seal up a blown head gasket leak and prevent further damage from taking place!

As an added bonus, Steel Seal offers their “Patented Conform-a-sealTM Technology” guarantees that their product really will solve your problem if you’re using it on an engine where the head gasket has already failed and is actively leaking coolant.

Plus they offer a money back guarantee in case you’re unsure – which means there’s no risk whatsoever in trying this stuff out when compared to how much it costs! Steel Seal Permanent Head Gasket Sealer permanently saves you money, time and hassle when it comes down to the repair of cracked heads or blown head gaskets.

This is an easy to use solution for a do-it-yourselfer who wants a quick fix without having to hire a mechanic. It’s also affordable and backed by an ironclad 100% money back guarantee, which makes it an excellent product that will last as long as your vehicle.

6. Permatex 80697 Copper Spray-A-Gasketpermatex 80697 copper spray a gasket

Permatex 80697 Copper Spray-A-Gasket Adhesive Sealant is a sprayable sealant that draws in heat from engine surfaces and disperses it, and also keeps gaskets from burning.

It’s an excellent choice for fixing cracked metal surfaces like cylinder heads and exhaust manifolds, plus it offers longer life than traditional aluminum oxide products. The copper particles resist corrosion better than aluminum oxide products that may be used elsewhere.

Lastly, this product is more than just a silicone spray. It’s also formulated from a proprietary blend of pure copper to withstand really high temperatures up to 500 degrees Fahrenheit, so it can be used around piping or other automotive components or even in any application that requires high-temperature protection and sealing capabilities.

One smart feature is it’s non-hardening and fast drying formula (less than 5 minutes) which makes it ideal for use on moving parts as well. This spray creates an instant fluid-tight barrier and resists all types of automotive fluids therefore making Permatex Copper Spray-A-Gasket Hi-Temp Adhesive Sealant a great choice

7. Bar’s Leaks Best Head Gasket Stop Leakbar's leaks block seal head gasket fix

The Bar’s Leaks is so easy to use that within an hour you may come to a decision as to whether or not your vehicle’s head gasket is permanently snugged down.

The liquid solution inside of this bottle is powerful sodium silicate that hardens up like glass after it has been applied.

This product can be applied over antifreezes and can fix the leaks in your head gasket for good. The capacity of Bar’s Leak Head Gasket Fix is compatible with both gas and diesel engines and will economically get you back on the road fast.

When you purchase this product, you will receive a combination of sodium silicate sealing particles and antifreeze-compatible sealing liquid that effectively seals off gaps, cracks, or holes.

There are over five million bottles sold because people know that Bar’s Leak Head Gasket Fix is ready for action when there are problems or leaking issues occurring in their car’s engine bay.


Best Head Gasket Stop Leak. Blown head gaskets are one of the hardest issues that vehicle owners have to deal with. If your car starts leaking coolant, then you probably have an issue with a blown head gasket.

Don’t worry though, because we’re going to help you find the right way to fix this problem yourself. You don’t have to take your vehicle into a repair shop if your car isn’t running well anymore and has been producing white smoke too.

Related Guide