5 Best Head Gasket Sealer (Pros & Cons)


Author: Alyn Dune

Looking for best head gasket sealer? I’m sure you already know that a faulty head gasket can cause all sorts of problems, such as engine misfiring and oil leaks.

Replacing a bad head gasket is usually necessary in the end, but there’s still hope; gasket sealers may be enough to get you by until you’re able to afford it.

Many different head gasket sealers are available online and in stores, some for installation and others for simply sealing.

I’m sure you already know that a faulty head gasket can cause all sorts of problems, such as engine misfiring and oil leaks. Replacing a bad head gasket is usually necessary in the end, but there’s still hope; gasket sealers may be enough to get you by until you’re able to afford it.

Many different head gasket sealers are available online and in stores, some for installation and others for simply sealing. Let me help you decipher which is the best option for your current situation.

Best Head Gasket Sealer – Steel Seal

Best Head Gasket Sealer - Steel Seal

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As one of the best head gasket sealers on the market, Steel Seal has earned a reputation for providing automotive repair professionals and DIYers alike with a reliable and effective way to fix head gaskets.

With its easy-to-use formula, there’s no need to remove and replace your cylinder head or block – just use Steel Seal and you’re all set. It seals cracked heads, blown head gaskets, warped or cracked heads and other cooling system failures in minutes.

This specialized product is designed to quickly and effectively repair any head gasket leaks, regardless of their size or location.

Steel Seal uses advanced technology to create an atomized alloy of copper, tin and silicon that bonds with all metals in your engine block. This creates a permanent seal that is up to 3 times stronger than other leading brands without any additional labor costs!

This revolutionary formula contains exclusive ingredients which are not found in other head gasket sealers.

It works by forming a permanently sealed bond on contact between itself and the metal surfaces surrounding a damaged area of the cylinder-head or engine block. When this bond forms, it creates an incredibly strong seal that prevents liquids from leaking through your engine’s vital parts.

Steel Seal is simple to use, can be applied without any major disassembly, and has been used successfully by thousands all over the world with remarkable results. Steel Seal also comes with a money-back guarantee so you can be sure it will work for your vehicle.

Best Head Hasket Sealer for 8 Cylinder – Bar’s Leak HG

Best Head Hasket Sealer for 8 Cylinder Bars Leak HG

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Bar’s Leak HG is a revolutionary head gasket sealer that has been designed to repair 8 cylinder engines.

Bar’s Leak HG contains critical additives that are designed to stop coolant loss and fix even the most difficult head gasket leaks. With its unique blend of chemical agents, it can restore reliability and performance in as little as one hour.

It works by sealing leaks in the head gasket area and restoring engine compression, while reducing heat buildup and oil loss. This product is one of the best solutions for fixing leaking head gaskets, allowing drivers to get back on the road quickly and with minimal effort.

The Bar’s Leak HG formula works quickly and efficiently, sealing all major oil, water, and gas-related issues within the cylinder block. The product is compatible with all types of engines from 4 cylinder to 8 cylinder vehicles.

The innovative formula of Bar’s Leak HG instantly seals any minor or major coolant leak in just 15 minutes, giving car owners peace of mind that their engine won’t overheat or run inefficiently, just dont forget your tire repair kit.

It also helps prevent future problems from occurring by strengthening existing seals. Furthermore, this product comes with a money-back guarantee so users can rest assured knowing they’re getting quality performance out of their 8 cylinder engine.

With easy application directions, users just need to pour it into their radiator fluid tank for fast results. Plus, there’s no need to remove any engine parts or flush out antifreeze – saving time and money!

Best Head Gasket Sealer for Subaru – BlueDevil 00209

Best Head Gasket Sealer for Subaru BlueDevil 00209

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BlueDevil 00209 is the best head gasket sealer for Subaru vehicles. This product offers a powerful and permanent solution to blown head gaskets, saving owners time and money. Unlike other products on the market, BlueDevil 00209 can be used with any type of engine coolant or antifreeze, making it ideal for those who need a fast and reliable fix.

Not only does it provide a permanent solution to head gasket failure, but it also prevents future issues from occurring. It’s an easy-to-use product that’s safe and effective, making it one of the most popular choices used by Subaru owners.

This head gasket sealer works on all types of Subaru cars and SUVs, like the Forester, Outback, Legacy and Impreza. It can fix leaky or blown head gaskets caused by overheating or other common problems.

The product is easy to use and does not require any advanced mechanical knowledge. Simply add BlueDevil 00209 directly into your radiator or reservoir, start the engine and let it idle for 20 minutes. The sealant will then spread throughout the cooling system, forming an effective barrier against leaks and seepage while maintaining proper pressure in the system.

Coolant Leak Repair – K-Seal Head Gasket Sealer

Coolant Leak Repair K Seal Head Gasket Sealer

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K-Seal Head Gasket Sealer is an innovative solution designed to repair damaging coolant leaks in vehicles. The sealer provides a reliable, permanent fix and restores the integrity of your engine by stopping coolant leakage.

K-Seal uses a patented formula to mix with the coolant, forming a strong seal on contact with metal surfaces. This advanced sealing technology works on all types of engines including petrol, diesel and even marine engines – making it ideal for use in multiple applications.

The product is easy to use and requires no extra tools or skills; simply shake the bottle before adding it directly into your coolant system via the radiator cap or expansion tank. K-Seal then sets off a reaction as soon as it comes into contact with hot metal surfaces to form a seal.

This all-in-one formula can be used in both petrol and diesel engines, restoring the head gasket to its original state, and preventing future coolant leaks from occurring.

Not only does K-Seal protect against further damage by sealing the head gasket, it also works to prevent rusting of metal surfaces and corrosion of plastic parts caused by leaking coolant.

In addition, it helps maintain engine performance levels by eliminating air bubbles that reduce efficiency. The sealer also protects against sludge build up which can block small gaps between metal parts to prevent further leaks.

High Temperature RTV – J-B Weld Head Gasket Sealer

High Temperature RTV J B Weld Head Gasket Sealer

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JB Weld Head Gasket Sealer is a revolutionary product that helps repair damaged head gaskets in automobiles.

This high temperature RTV silicone gasket maker and sealer offers permanent results, providing an even better seal than traditional gasket materials. It forms a strong, flexible bond to prevent leaks while withstanding temperatures up to 500°F, making it perfect for automotive repairs.

The advanced formula is designed to fill gaps and irregularities between mating surfaces and form an oil-tight seal that can resist extreme pressures. With its fast curing time of one hour and easy application by brush or roller, this head gasket sealer provides a reliable solution for all your automotive needs.

It is designed to permanently seal coolant and oil leaks in the cylinder head gaskets with no special tools required. This sealer works quickly and efficiently, making it a great choice for both professional mechanics and home DIYers alike.

Head Gasket Common Problems

As an engine’s essential component beside best tire dressing to prevent dry rot, head gaskets can suffer from various malfunctions such as oil to external leakage, coolant to outside leakage, coolant to oil leakage, compression to external leakages and compression leakages to coolant.

1. Engine Bay

If the gasket fails in between the engine’s internal oil system and the exterior environment then it will cause an oil leak in the engine bay resulting in decreased oil pressure.

2. Coolant Leakage

When a head gasket is damaged somewhere between an engine water channel and the outside of the engine, there will be a noticeable coolant leakage that can vary from minor to intense. As a result, coolant levels will drop significantly and overheating might become a major risk if not addressed immediately.

3. Contaminated Oil

If the head gasket is defective somewhere between an oil channel and a coolant channel, this could lead to contaminated oil with a milkshake-like appearance. Compression-to-outside leaks generate a sharp ticking sound when idle, leading to rough idling, jerky acceleration, and power loss.

4. Overheating

Finally, if a cylinder and water channel do not work together properly, then this will let exhaust gases into the cooling system. This can increase pressure in the cooling system, resulting in hoses being dislodged from their fittings and a lower coolant level leading to overheating. Dont forget to bring fire extinguisher for car to prevent any bad scenarios!

You can smell something sweet inside the cockpit or near the vehicle, and you will notice white smoke coming out of the exhaust pipe – both of these are signs that something is wrong with the cooling system and exhaust system due to combustion of steam from coolant.

Does any of the head gasket sealer really work?

YES! this is a correct assumption. Head gasket sealers are made to cover the microscopic crevices between the motor block and cylinder head, preventing further leakage.

Sometimes, they can even help reestablish compression, seal a refrigerant escape, or lessen engine disturbance. While these sealers may be useful for minor problems, they are no substitute for a new head gasket.

Pros and Cons of Gasket Sealer

Here are some pro and cons of gasket sealer before you apply on your own!


  1. Improved sealing: Gasket sealers create a strong bond between two surfaces, providing an airtight and leakproof connection. This is especially beneficial in industrial settings where tight seals are necessary for safety reasons
  2. Resistant to high temperatures: Gives reliable protection against extreme temperatures and vibration which can cause wear and tear on engine parts. These sealers are also designed to work with all types of liquids including water and oil. This makes them ideal for different types of engines where liquid coolant is required to regulate heat levels.
  3. Easy to apply: Applying the sealant is relatively straightforward and can be done in as little as an hour or two depending on the type used. Most brands offer a range of formulas that vary in their effectiveness and installation time frame, giving car owners more options when selecting one that best fits their needs.
  4. Cost-effective: The cost of sealing a faulty gasket can be significantly lower than replacing the entire component or getting professional help. This makes the product ideal for do-it-yourself repairs as well as those who are on tight budgets.


  1. Drying time: This type of product needs several hours to dry and sometimes even days, depending on the exact temperature and humidity conditions in your repair area. During this long period of waiting for it to dry, your engine will not be able work properly or safely until the sealer has completely dried out.
  2. Not suitable for all applications: Gasket sealers may not be suitable for all engine applications, using a head gasket sealer is not recommended if there is evidence of physical damage on the gasket or other parts. It can also cause additional damage to occur as it thickens over time and clogs up vital oil passages and water channels.
  3. Can cause damage: One of the main risks associated with using a head gasket sealer is causing serious damage to your engine if the product’s directions are not followed precisely. The wrong mixture or application could lead to clogging in the cooling system or worse, permanent damage caused by chemical reactions between different parts of the engine.

How long does head gasket sealer last?

Generally speaking, quality products can last anywhere from 1 year to 5 years depending on these variables. For example, copper-based sealers tend to be more durable than rubber-based ones.

Should I change my oil after using head gasket sealer?

If you are using a liquid sealant, such as Bar’s Leaks or Blue Devil, then changing your oil is not required. However, if you have used a more permanent solution, like steel-reinforced epoxy, then it is recommended that you replace your vehicle’s oil afterwards. This will help remove any particles or metal shavings that may have been released during installation of the new gasket pieces.

Can you use too much gasket sealer?

Applying too much gasket sealant on or around a gasket can lead to clogging, overheating and oil leaks.

When applying gasket sealer, it is important to use the right amount for the job. Too little will not provide enough protection against pressure or leaks, while too much can cause blockages and reduce heat dissipation from the engine.

The best way to ensure you get the correct amount is to refer to your vehicle’s service manual for specific instructions regarding how much sealant should be used for each type of application.

Do thicker head gaskets seal better?

Thicker head gaskets are typically used for high-performance engines which need a strong and consistent seal under increased stress levels. They tend to be made out of materials such as steel or copper shim, graphite paper or composite laminate which provide superior sealing capabilities.

Thinner head gaskets can also be effective in sealing engines but they may not hold up as well under extreme pressures or temperatures.

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