Best Head Gasket Sealers (Review & Buying Guide) in 2020 | The Drive

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Last Updated: June 24, 2019

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Published on June 24, 2019

Blowing gaskets is one of the biggest nightmares that car owners must face. This can cause other problems, such as coolant mixing with the oil in the engine, engine misfires and oil leakage. In order to effectively fix the blown gasket, you have two options: you can completely replace the top cover gasket, or you can use the affordable top cover gasket sealant on the market. As there are many different brands of products, please read our reviews carefully to find out the most suitable gasket or engine cylinder head gasket for your leakage problem.



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All our reviews are based on market research, expert opinions or practical experience of most of the products we contain. In this way, we provide a true and accurate guide to help you find the best option.

BlueDevil is a company that produces professional-grade sealants for the automotive industry. The company supplies products to more than 400 distributors in North America, South Africa, Asia, Europe and South America. BlueDevil began selling its products in 1997 and is currently headquartered in South Carolina. The company produces some of the best gasket repair additives


It is one of its popular products.

ATP Motor Company is a well-known manufacturer of automobile products, which has existed since its establishment in 1955. The company has a 2,000 square foot state-of-the-art facility in Chicago, and the company produces top-of-the-line product delivery for automatic after-sales parts and car care products. Consider trying

, Only a small amount of leakage in the head gasket is sealed. 

K-Seal is an international company that produces and distributes sealants worldwide. The company prides itself on its ability to sell millions of sealant bottles each year. It is currently located in New Jersey. This

It is one of the cheap head gasket sealants produced and distributed by K-Seal.

Steel Seal is a sealant manufacturing company dedicated to manufacturing and selling head gasket sealants. The company has been in business since 1999 and has provided mechanical solutions to thousands of mechanics and car owners. Steel Seal is headquartered in the United Kingdom. This

It is one of its best sealing gaskets.

The amount of sealant is in ounces. The quantity ranges from 8 ounces to several gallons. Buy sealant that is enough to solve your problem. For small engines, a 16-ounce container is enough to seal the blown cylinder head gasket so you can reach your destination. It is also a good idea to prepare a small container for emergency situations.

It is easy to deal with gasket leakage, just pour the sealant into the radiator. However, other problems may arise, and you may need to have some technical knowledge about the sealing process. Make sure that the product you choose is easy to use and provide clear instructions on how to seal different leaks.

The steel gasket sealant comes in two bottles, enough to fill people with larger engines (such as eight-cylinder engines). The product comes with easy-to-follow instructions, although you need some automotive knowledge to use it. The sealer is designed to solve different symptoms of blown gaskets, including white smoke, engine overheating, external leakage and watery oil.

The uniqueness of this sealant is that it is designed to solve the leakage problem of old engines with only one application. Moreover, this sealant has no particles that can accumulate, block the tubes and cause more problems with the engine. Even when exposed to high temperatures, the fluid will act by bonding to cracks and cracks and provide a permanent sealing solution. You can expect fast sealing action, and the sealant works well with gasoline and diesel engines.

Although the sealing machine is effective, it is expensive. There are cheaper options that can provide almost the same quality as the product. You must also flush the system before using this sealant. If you do not have enough time or money to buy new coolant, it will cause inconvenience. However, for people with larger engines, old trucks and second-hand cars, this sealer is a good choice.

K-Seal ST5516 HD is a "rock, pour, and walk" type gasket with an affordable price. The outstanding feature of this product is that it is compatible with any antifreeze product, thus eliminating the need to flush the coolant system before use. This is a multi-purpose product, you can safely use sealant to solve other leakage problems related to heater core, engine block, water pump casing and antifreeze plug.

The formulation used to make the product uses a nanotechnology that involves microfine fibers that can seal cracks and leaks. The product is packed in a small 8-ounce container and can handle up to 12 gas cylinders. You can expect to see the effect of the sealant within three minutes after application. The sealant is easy to use and does not require any special skills.

The sealant may be fast, but only for minor leaks. If you are dealing with large amounts of damage, you may need to consider other products. In some cases, the sealant will discolor certain brands of antifreeze products. However, this sealant is a good choice for people looking for an effective but affordable sealant.

BlueDevil gasket sealant is an easy-to-use sealant that can save you car repair costs. This is a professional-grade head gasket sealing machine, which also solves the leakage problems related to the heater core, antifreeze plug and other components related to the coolant other than the radiator core. As long as you follow the instructions provided, the sealing machine can provide a permanent leak repair solution. 

Regardless of the number of cylinders, the product can be used on gasoline and diesel engines. The advantage of this sealant is that it can form a strong bond with a variety of materials (including cast iron, plastic, aluminum, alloys and many other types of metals). It can also work well on cracked or warped nozzles, and you don't have to worry about loss or leakage of coolant. This product solves the internal engine problem, thereby increasing the mileage.

The main disadvantage of this product is that after a period of time, it may start to block the tubes and passages of some solid materials. This may be due to the reaction of the sealant when heated in the chamber. After using the sealant, the thermostat may still have some problems. You must also use the sealant with fresh coolant. Otherwise, it will not work effectively.

This gasket sealant and belt dressing comes in an 8-ounce can and is known for the image of a young woman on it. It is very flexible, making the assembly/disassembly of the engine and gearbox easier. The excess Gasgacinch is easy to wipe off without any solvent. The sealant can bond to a variety of surfaces, including steel, aluminum, titanium, lead, magnesium, rubber, and copper.

A major function of this sealing machine is that it can be used in various environments (hot, cold, humid, dry, etc.). It has high heat resistance, gasoline and oil resistance. After curing, the sealant has flexibility, fatigue resistance, high peel strength and high shear strength. It is ideal for car, motorcycle and truck repairs and is popular among high-performance engine manufacturers.

There are not many problems with this product. The disadvantage is that it is packed in a small container. In addition, every time you use it, air will infiltrate, unless you have not used it up, the air will quickly deteriorate. There are also complaints that the applicator is not a brush.

This high-viscosity gasket sealant comes in a variety of sizes, including 4oz and 16oz cans and aerosol cans. It dries quickly, is highly viscous, and produces a non-breakable film. The product can work in a temperature range of -65 degrees Celsius to 500 degrees Fahrenheit. It has the properties of gas resistance, oil resistance, antifreeze, propane and so on.

This is a cheap universal gasket adhesive. As long as you seal it correctly after each use, it has a long shelf life. The rod of the cover and the brush are mounted together, so it is easier to use. It is very suitable for fixing gaskets that are easy to slide, such as oil pans and other upside-down covers. It is also suitable for water pumps, timing chain covers and other applications that use thin paper gaskets.

However, it has a strong smell. The product is also very messy. The length of the applicator is less than the depth of the can, so it is difficult to take out the last bit of it, especially after it has been dried a bit.

This permanent head gasket sealant uses antifreeze compatible sodium silicate sealant and multiple gasket sealing elements to prevent leakage. Liquid technology is designed to repair damaged, leaking and blown head gaskets. It can also seal cracked cylinder heads and cylinder blocks.

The US-based company enjoys a high reputation, and its first patent for gasket leak repair dates back to 1950. Users report that the product works as described above. It can block the leakage on the head gasket and solve other minor problems. This is a professional-grade product and easy to use.

One disadvantage is that if your heater core is partially clogged, this sealant may clog it. It is also really thick and may be difficult to pour into the radiator. In addition, in many cases, it is only a temporary solution, not a permanent solution (despite its name).

The high-quality head gasket gasket is carefully designed to function effectively without damaging the engine. Most sealants have been tested and can be used with diesel or gasoline engines and different materials such as plastic, aluminum and cast iron.

It depends on the degree of damage you are dealing with. Most head gasket sealants provide a permanent solution to permanent leakage. However, they can only provide a temporary solution for serious leaks, and eventually, you may need to completely replace the gasket.

Different brands have different qualities. Although some can last a long time, some don't. It also depends on the severity of damage to your head gasket. Most sealants provide a permanent solution to a permanent leak, but if the damage is severe, it can only last for six months.

The sealant is designed to fill the small holes in the head gasket. However, most of them can also block leaks in gearboxes, power steering and hydraulic systems. If you want to deal with larger holes that the sealer cannot handle, you should consider replacing the head gasket. 


It is our first choice for the best overall permanent head gasket sealant. It is suitable for new and old vehicles, suitable for cars, vans, SUVs and trucks.

If your budget is a bit tight, but you still need a professional sealing machine, please check

. This is an affordable sealant with most of the qualities you can find in more expensive brands.


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