Best Head Gasket Sealers

Review & Comparison, Last Update March 12, 2020
Head gasket sealers allow the least experienced users to fix warped, blown, and cracked head gaskets. The best head gasket sealers also make sure that these issues do not repeat some time down the road. ...Read more ...Read less
BEST 2020
PROS
CONS
OUR VERDICT
Suitable For
Works With
Volume
How to Use
Warranty
 
PROS

The product does not incorporate any solid or particulate matter, so the vehicle's engine will not be harmed. Aside from head gaskets, you'll be able to treat heater cores and freeze plugs. 

CONS

The product does not last once you open the bottle. 

OUR VERDICT

Professional mechanics choose BlueDevil Head Gasket Sealer more often than the five products behind this one combined. With its help, you'll be able to save a lot of money on repairing head gaskets as well as warped and cracked cylinder heads. 

detailed parameters
Suitable For

Gas and diesel engines 

Works With

Aluminum, Cast Iron, Steel, Plastic, Elastomer

Volume

32 fl. oz. 

How to Use

1. Slowly pour the liquid into the radiator

2. Let the vehicle idle with the radiator cap on for 50 minutes

Warranty

60 days 

PROS

The solution will be able to prevent coolant loss and eliminate overheating. It might even solve the issue with bubbles entering the system. You can apply the product onto silicone and copper elements. 

CONS

The solution is pretty thick (might clog cooling systems). 

OUR VERDICT

Bar's Leak HG-1 packs 33.8 fluid ounces, making the bottle large enough to treat even V8 and V12 gas engines. The product requires no more than 15 minutes to treat the issue. You'll even be able to solve problems with white exhaust smoke. 

detailed parameters
Suitable For

Gas and diesel engines 

Works With

Aluminum, Cast Iron, Steel, Copper, Plastic, Elastomer 

Volume

33.8 fl. oz. 

How to Use

1. Pour the liquid into the radiator

2. Let the vehicle idle with the radiator cap on for 15 minutes

Warranty

Limited lifetime 

PROS

The sealed parts will usually remain sealed for decades. The agent is compatible with most coolants and antifreeze products. The formula is pretty runny, so you don't have to worry about clogging cooling systems. 

CONS

The product takes some time to apply. 

OUR VERDICT

BlueDevil Pour-N-Go, with its 16-fluid-ounce bottle and an affordable price, is an excellent product for inexperienced drivers looking to solve problems with head gaskets. Despite the price, the solution is compatible with 4-cylinder and V6 engines. 

detailed parameters
Suitable For

Gas and diesel engines

Works With

Aluminum, Cast Iron, Steel, Plastic, Elastomer 

Volume

16 fl. oz. 

How to Use

1. Pour the liquid into the radiator

2. Let the vehicle idle with the radiator cap on for 50 minutes

Warranty

60 days 

PROS

The military-strength fibers will be putting multiple treatment layers over the breaches, eclosing them with web-like weaves. The Cool-X Conditioner lowers the operating temperature while the agent circulates through the cooling system to prevent overheating. 

CONS

You'll have to shake the bottle for 30-60 seconds before usage. 

OUR VERDICT

K&W 401224-6 FiberLock is precise, making sure that the breaches are not only sealed but also remain sealed. It is compatible with most antifreeze products. Even the biggest cracks are not big enough to tussle with this product. 

detailed parameters
Suitable For

Gas and diesel engines

Works With

Aluminum, Cast Iron, Steel, Plastic, Elastomer 

Volume

32 fl. oz. 

How to Use

1. Pour the liquid into the radiator

2. Let the vehicle idle with the radiator cap on for 15 minutes

Warranty

Amazon's 30-day return policy 

PROS

The liquid ceramic is applied thin and even, protecting the head gasket against corrosion buildups. You can purchase two bottles and treat even large trucks' engines, dumping them both at the same time. 

CONS

The agent will only be able to seal small cracks. 

OUR VERDICT

K-Seal ST3501 will work even with SUVs'/small trucks' engines. The product keeps circulating even when the temperature drops below minus 38 degrees Fahrenheit. You'll be able to permanently fix porous engine blocks and cracked heads.

detailed parameters
Suitable For

Gas and diesel engines

Works With

Aluminum, Cast Iron, Steel, Plastic, Elastomer 

Volume

16 fl. oz. 

How to Use

1. Pour the liquid into the radiator

2. Let the vehicle idle with the radiator cap off on for 20-30 minutes 

Warranty

Amazon's 30-day return policy 

BlueDevil Products Head Gasket Sealer

The Slow One Wins the Race

BlueDevil Head Gasket Sealer will cost you, let's get that out of the way first. But the product will only cost you at the beginning and will likely save you more money than you'd expect in the long run.

First things first, the solution is basically harmless, with the formula free from solid and particulate matter that might harm the vehicle's engine. Normally, harmless means pretty much useless but that's very much divorced from reality here. On the contrary, this product is more effective than any sealer we've looked at. Sure, with its help, you'll be able to repair and seal leaks in blown head gaskets. In addition to that though, the solution is also capable of sealing warped and cracked heads, heater cores, and freeze plugs.

It is able to work with steel, aluminum, cast iron, plastic, and elastomer, further expanding the product's application range. All you have to do is slowly pour the liquid into the radiator and let the automotive idle with the radiator cap on for ~50 minutes.

From where we're standing, the product's flaws are limited to the fact that the agent does not last once you open the bottle, so we would not recommend investing in this product when all you have to do is seal one small crack. Other than that, there's no reason not to give this blown head gasket sealer a go.

Review of BlueDevil Products Head Gasket Sealer Permanent repair

Additional Info

User Manual     Manufacturer


 

Bar's Leak HG-1 HEAD SEAL

Even Copper Elements

Bar's Leak HG-1 believes that modesty is unnecessary. This product not only does basically everything but it is able to do that better than most targeted solutions.

Using this agent, you'll face very few challenges repairing blown head gaskets and intake gasket leaks. The product will allow you to seal warped and cracked heads and blocks. Preventing coolant loss, the agent will be eliminating overheating. You'll even be able to fix the issue with bubbles entering the cooling system. All that being said, the agent is pretty thick, thick enough to sometimes clog cooling systems, so we would recommend taking the dimensions into account before pouring the product.

When treating issues with head gaskets though, you won't have to do much more than pour the solution into the radiator and allow the vehicle to idle with the radiator cap on for 15 minutes tops. Plus, besides cast iron, aluminum, steel, plastic, and elastomer that most sealers are suitable with, this agent also works with copper elements and silicone parts.

Before wrapping this one, the bottle packs almost 34 fluid ounces, so you'll even be able to treat vehicles with V8 and V12 engines. To sum this up, there's practically no occasion that Bar's Leak HG-1 cannot rise to.

Review of Bar's Leak HG-1 HEAD SEAL Blown Head Gasket Repair

Additional Info

User Manual     Manufacturer


 

BlueDevil Products Pour-N-Go

No Experience Necessary

BlueDevil Pour-N-Go does not require ample experience in the engine field. In fact, as far as we're concerned, this is one of the easiest and more straightforward sealers we've come across.

As the "Pour-N-Go" part of the name would imply, the only action required from you is pouring the solution into the vehicle's radiator. Then, make sure the said vehicle is idling with the radiator cap on for about 50 minutes. Sure, 50 minutes is more than you'd expect considering that "Pour-N-Go" part that we've addressed above but that's where the product's shortcomings basically conclude.

Using this product, you'll be able to seal blown, cracked, and leaking head gaskets knowing that the seal will be close to permanent. The product is compatible with 4-cylinder and V6 engines, so most cars will apply here. Also, the agent works with most materials, including elastomer, plastic, aluminum, cast iron, and steel. To conclude its compatibility range, the product can be used with water, antifreeze, and most coolants. The formula is not thick at all, so you won't be clogging the cooling systems.

Again, you don't have to be an experienced, big-time mechanic to use this product and fix most issues with head gaskets.

Review of BlueDevil Products Pour-N-Go Head Gasket Sealer

Additional Info

    Manufacturer


 

K&W FiberLock

No Guesswork Here

K&W 401224-6 FiberLock is less about guesswork and more about precision and targeted treatment. With this product, you not only will be fixing head gaskets, cylinder heads, engine blocks, and cooling systems, you'll also be making sure you're not facing these problems down the road anymore.

Employing military-strength fibers, the solution puts multiple layers over the treated areas with web-like weaves enclosing the cracks. With nanobots, the product ensures that even the smallest cracks and crevices remain sealed. Meanwhile, the Cool-X Conditioner tech will be lowering operating temperature as the solution is circulating through the cooling system, preventing overheating. This part will also allow the car to take less time to start during freezing temperatures. The agent's compatible with most antifreeze types, so you won't have to purchase anything specific.

We were thoroughly impressed with the product except for the part where you have to shake the bottle for 30-60 seconds before usage, which is pretty tedious but not something that breaks the product. Considering its potency, it is hard to imagine anything breaking this product and hard to imagine car owners that won't be able to benefit from this head gasket sealer somewhere down the proverbial road.

Review of K&W FiberLock Head Gasket & Block Repair

Additional Info

    Manufacturer


 

KALIMEX LTD K-Seal

Even SUVs and Small Trucks

K-Seal ST3501 keeps things simple and the price more than reasonable. The product presents that permanent fix that blown head gaskets, porous engine blocks, and cracked heads/blocks need to stop harming the engine. Its formula is compatible with most (likely even all) water-cooled engines, meaning you won't have to drain and flux the cooling system and you won't have to buy specific coolants or antifreeze products different from what you've been using before. Just shake the bottle, pour the solution into the radiator, and allow the car to idle for 20-30 minutes, removing the radiator cap beforehand.

The 16-fluid-ounce bottle will be enough to treat even SUVs and small trucks' cracked heads and blown head gaskets. With larger engines, all you have to do is double the dosage and add another bottle.

The product works with cast iron, steel, aluminum, plastic, and elastomer, not unlike the sealers we've reviewed above. It won't be able to seal large cracks though, something that the previous product is capable of.

Even taking that into account though, this is a solid head gasket sealer that should be able to allow drivers with blown head gaskets to fix the issue with the engine without paying professional mechanics a king's ransom.

Review of KALIMEX LTD K-Seal Pour and Go Permanent Head Gasket and Block Repair

Additional Info

User Manual     Manufacturer


 

What Is a Head Gasket Sealer?

With the head gasket sitting between the engine block and the cylinder head, it is able to optimize compression and prevent the coolant/oils from leaking into the cylinders, so you cannot overestimate this component's importance. Fixing the gasket that's blown, warped, or cracked can cost you a small fortune sometimes when usually all you have to do is dump some head gasket sealer into the radiator and you should be good to go.

The right product will not only fix these issues with the head gasket but also eliminate coolant loss, prevent overheating, and even sometimes repair heater cores and freeze plugs. More often than not, gasket sealers are compatible with different coolants, do not discriminate against varying antifreeze products, and are able to work with various materials, including aluminum, steel, cast iron, plastic, elastomer, and, occasionally, even copper. Just make sure that the formula is not too thick since otherwise, you might clog the cooling system.

These engine degreasers and aluminum cleaners will complete the engine aid package and will let you solve most issues without paying the pros.

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Publish Date: 2020-03-12 08:00:10