What Are The Best Head Gasket Sealers? (2020 Reviews)

Best Head Gasket Sealers

To keep your vehicle safe and healthy, maintaining your engine is the key to ensuring your car runs in the best condition. Any damaged head gaskets need to be repaired using a quality sealer that can offer permanent fixes. If leaks from cracked or blown gaskets go unattended, they can lead to the engine misfiring and more significant internal damages to your vehicle.

Sealants are the most effective in preventing leakage, and some can even fix leaks from the heater core. Finding the most effective head gasket sealer for a great value is important to save your money and keep your car functioning safely.

2020’s Top Head Gasket Sealers – Reviewed

Best Overall
BlueDevil Head Gasket Sealer (38386)
Runner Up Pick
Steel Seal Blown Head Gasket Fix Repair Sealer - 6 Cylinder
Best on a Budget
K-SEAL Coolant Leak Repair, ST5501 8oz, Multi-Purpose Formula Stops Leaks in the Radiator, Head...
BlueDevil Head Gasket Sealer (38386)
Steel Seal Blown Head Gasket Fix Repair Sealer - 6 Cylinder
K-SEAL Coolant Leak Repair, ST5501 8oz, Multi-Purpose Formula Stops Leaks in the Radiator, Head...
Best Overall
BlueDevil Head Gasket Sealer (38386)
BlueDevil Head Gasket Sealer (38386)
Runner Up Pick
Steel Seal Blown Head Gasket Fix Repair Sealer - 6 Cylinder
Steel Seal Blown Head Gasket Fix Repair Sealer - 6 Cylinder
Best on a Budget
K-SEAL Coolant Leak Repair, ST5501 8oz, Multi-Purpose Formula Stops Leaks in the Radiator, Head...
K-SEAL Coolant Leak Repair, ST5501 8oz, Multi-Purpose Formula Stops Leaks in the Radiator, Head...

Below we’ve reviewed the top 7 head gasket sealers available in 2020.

1. BlueDevil Head Gasket Sealer

The BlueDevil Head Gasket Sealer is a safe, high-quality product that prevents coolant leaks and permanently repairs head gasket damages. You can avoid time-consuming visits to the mechanic with this easy-to-use sealant.

Our choice for best overall is the BlueDevil Head Gasket Sealer. This is a high-quality product compliant with ASTM standards and does not contain any harmful solids or particles. It is safe for your engine, so you don’t have to worry about internal damages.

This product can be used to fix your gasket and help repair any engine blockage. It is a great alternative solution for time-consuming and costly repairs. This sealer is also excellent in any weather conditions and prevents coolant leaks and loss of radiator fluids.

This head gasket sealer from BlueDevil permanently repairs your head gasket problems. It is easy to use this product by following the clear instructions written on the bottle. The only con we found was that you need to first flush out your engine for this sealant to work.

Pros

  • Contains no harmful chemicals or solids
  • Easy and safe to use
  • Permanently repairs

Cons

  • Requires you to flush out your engine

2. Steel Seal Blown Head Gasket Fix Repair Sealer – 6 Cylinder

The Steel Seal Blown Head Gasket Fix Repair Sealer is a high-quality sealer that permanently stops leaks. It works quickly and efficiently and comes with a money-back guarantee.

Our runner up pick is the Steel Seal Blown Head Gasket Fix Repair Sealer. It permanently seals cracks and acts as a long-lasting solution to leaks. This product is a reputable and high-quality sealer used by thousands of repair shops across the nation. It works quickly and efficiently after you drain the system, and the clear instructions are easy to follow.

Steel Seal has full faith in the quality of their product, backing it with a 100% money-back guarantee. For anyone facing problems with their 6 cylinder engine, this is a highly recommended product to consider. However, it is expensive and is not compatible with all engine types.

Pros

  • Permanently repairs
  • 100% money-back guarantee
  • Supports 6 cylinders

Cons

  • Expensive
  • Not compatible with all engines

3. K-SEAL Coolant Leak Repair

The K-SEAL Coolant Leak Repair is affordable and easy to use. It can be used to quickly fix a variety of repairs using harmless chemicals that permanently seal up cracks.

The K-Seal Coolant Leak Repair may be best on a budget because of its very affordable price, ease of use, and quick repair time. It is formulated to quickly weld radiators and hard plastic aluminum heads. It is excellent for various repairs, including the head gasket, cylinder heads, and freeze plugs.

This formula is made of a mixture of unique chemicals that repair the damage without harming the engine. It flows through the coolant and locates cracks. Then the particles in the solution form a reliable seal against the leak to create a permanent fixture. This sealer can be mixed with antifreeze as well without damaging your engine.

Instead of flushing out or draining your engine, simply shake, pour, and let it work. It is one of the most affordable sealers out there and provides a permanent coolant leak seal. However, it does not fix water pumps, and repairs using this product have weakened over time.

Pros

  • Repairs quickly within minutes
  • Can be used on a variety of repairs
  • Permanently seals coolant leaks

Cons

  • Does not work on water pumps
  • Repairs weaken over time

4. AT-205 Seal Leak Stopper 8 Ounce – 2 Pack

The AT-205 Seal Leak Stopper uses a fast-acting formula to seal cracks and restore rubber seals and gaskets. It is safe to use with other liquids and does not overswell or break down other areas of your engine.

The AT-205 Seal Leak Stopper provides professional fixes through its fast-acting formula. It works well to reseal cracks and can also be used to rejuvenate all rubber seals and gaskets in transmissions, engines, differentials, power steering, and hydraulic systems.

This versatile product is safe to use with various liquids, including conventional and synthetic oils, power steering fluids, hydraulic oil, ATF, and gear oil. It does not contain any petroleum distillates, meaning it is safe to use and will not damage your engine. This leak stopper will also not overswell or break down seals.

Pros

  • Rejuvenates all rubber seals and gaskets in the engine
  • Compatible with various types of oils and fluids
  • Restores various parts of the engine

Cons

  • Makes oil stickier
  • Can only work on rubber seals

5. Bar’s Leak Blown Head Gasket Repair

Bar’s Leak Blown Head Gasket Repair comes at a great price and offers fixes for a variety of damages to your engine. It can stop even the most difficult leaks and comes with a money-back guarantee to ensure quality.

Bar’s Leak Head Gasket Repair is great for addressing a variety of damages to your engine, and provides the best value. It can seal cracked cylinder heads and blocks. It also offers permanent repairs to blown head and intake gasket leaks that are long-lasting. This sealer from Bar’s will instantly stop even the most stubborn leaks.

It can be used to fix leaks in your radiator and heater core. It can also fix leaking freeze and core plugs. However, this product does tend to plug the heater core. It also does not work well in repairing pesky internal leaks.

This quality product from Bar’s has a money-back guarantee, ensuring that you will receive a quality head gasket sealer to make the repairs you need.

Pros

  • Multi-purpose use for a variety of repairs
  • Instantly stops leaks
  • Money-back guarantee

Cons

  • Does not work well repairing internal leaks
  • Tendency to clog the heater core

6. K&W Permanent Head Gasket & Block Repair with Nanotechnology

K&W’s Permanent Head Gasket & Block Repair with Nanotechnology uses advanced technology to permanently repair leaks or cracks in your engine. The instructions may not be the easiest to understand, but it offers quick fixes for a reasonable price.

Using nanotechnology to treat damages, K&W’s unique formula acts fast in creating permanent repairs to your engine parts, and is our most advanced option. After pouring in the solution, it finds cracks and allows particles to build a sturdy seal against even the smallest crevices, stopping all leakage. This powerful bond is long-lasting and permanently repairs any cracks or leaks your engine may have.

This product can address a variety of repairs, including engine blocks, heater cores, and radiators. It needs to be used without antifreeze, meaning your cooling system will need to be drained before application. The instructions are lengthy and convoluted, which can make it difficult to follow. This sealer may also not be compatible with all engine types.

However, the K&W Head Gasket & Block Repair fixes coolant leaks quickly. If you’re looking for a permanent solution for a reasonable price, this product is one to consider.

Pros

  • Can be used for a variety of repairs
  • Uses quick nanotechnology
  • Permanently repairs

Cons

  • Instructions are difficult to understand
  • Not compatible with all engines

7. K&W FiberLock Head Gasket & Block Repair

The K&W FiberLock Head Gasket & Block Repair uses Military-Strength Fibers, Nanotechnology, and Cool-X Conditioner to make high-quality repairs. Unlike other sealers, this product is compatible with most engines and vehicles.

The K&W FiberLock Head Gasket & Block Repair is an easy-to-use formula for DIY repairs, and we’ve labeled it our most user-friendly pick. It uses 3 unique technologies to make high-quality fixes. Military-Strength Fibers create a multi-layer repair over cracks using a web-like weave, while Nanotechnology seals cracks of all sizes. The Cool-X Conditioner works to lower operating temperatures when it circulates through the cooling system.

No drainage is necessary to use this product. It can be used with antifreeze or plain water. It permanently fixes engine blocks, cylinder heads, cooling systems, and head gaskets. Unlike other products, this head gasket sealer is compatible with most engines and is suitable for a variety of vehicles.

The K&W FiberLock Head Gasket & Block Repair may clog your radiator after use. However, it seals holes without damaging your engine and creates durable repairs with ease.

Pros

  • Permanently repairs a variety of damages
  • Reliable and durable
  • Compatible with most engines

Cons

  • May clog the radiator

What to Consider When Choosing the Best Head Gasket Sealer

A high-quality head gasket sealer can save you tons of money and time when used properly. However, choosing the right one is essential to avoid damaging your engine. When buying, consider factors such as the product’s compatibility with your engine, the longevity of repairs, and its ease of use.

Compatibility with Engine

To avoid damages, make sure the head gasket sealer you use is safe for your engine type. Not all formulas are compatible with all engines, and using the wrong one can cause your vehicle to overheat.

Longevity

Most head gasket sealers claim to offer a permanent solution to your leaks, but make sure it includes the right technology in its formula to create solid seals. Choosing an affordable but good-quality sealer will most likely prevent future leaks and build a strong bond to block cracks and crevices.

Ease of Use

You don’t want to choose a product that is difficult to use if you are making repairs on your own. Ensure the head gasket sealer’s instructions are easy to understand, so you don’t accidentally cause more damage to your engine.

Final Thoughts

It is crucial to take care of your vehicles to make sure they last a long time. Repairing a blown head gasket and other cracks or leaks can prevent further damage to your engine. Head gasket sealers are a great product to use to make quick fixes on your own without expensive visits to the mechanic.

However, choosing the right product for your vehicle that will create a permanent repair is essential. Use this guide to find the right head gasket sealer for you to get your car back on the road in no time.

Brett Gordon
 

The engine behind editing at DigMyRide and the brains behind its build. During the day, Brett is a thirty-something dude from SoCal climbing the corporate ladder, but by night, he spends his time contributing to the online world of automotive tech & trends.