Head Gasket Sealer


A head gasket sealer is a great helper when you need it the most. Specially created to offer fast results for leaking gaskets, this type of product is an excellent temporary alternative to expensive repairs. At the same time, a head gasket sealant is easy to use, so it doesn’t require advanced mechanic skills to successfully fix a head gasket failure. So, if you’re in search of a reliable sealer that provides excellent results, look no further because this article will present you the best products you can find at the moment.


Top 9 Head Gasket Sealers Comparison

Photo Product Weight (oz.) Container Type Instructions Provided Guarantee Price

Best Overall
1. Steel Seal Blown Head Gasket 16 Bottle 100% money-back guarantee Check Price

Our Choice
2. BlueDevil Head Gasket Sealer 32 Bottle 60-day money-back guarantee Check Price
3. Bar’s Leak HG-1 Head Seal 33.8 Bottle 100% money-back guarantee Check Price
4. CRC Permanent Head Gasket & Block Repair 32 Bottle Double money-back guarantee Check Price
5. Bears True Blue Head Gasket Sealer 2 x 16 Bottle 100% money-back guarantee Check Price
6. K&W FiberLock Head Gasket & Block Repair 32 Bottle Double money-back guarantee Check Price
7. Permatex 80063 High Tack Gasket Sealant 16 Bottle Money-back guarantee Check Price
8. K-Seal ST3501 16 Bottle Money-back guarantee Check Price
9. ATP AT-205 8 Bottle 1-year warranty Check Price

Reviews of the Best Head Gasket Sealers

Steel Seal Blown Head Gasket

There are a few similar products as efficient as the Steel Seal. Its unique formula promotes a durable seal, without clogging the cooling system. This formula has been available since 1999, so it was tested by many mechanics and car owners alike. A proof of quality is the money back guarantee.

Formula

Unlike many other products, this one creates a long-lasting seal. It has a high success rate – 99% – but in case the hole is too big, there’s a possibility to fail.

  • Efficient chemicals: the chemicals used in manufacturing the product create a strong seal. For best results, make sure you always follow the instructions provided.
  • No fibrous materials: there are no materials that can clog the cooling system.

Best Usage

This formula is ideal for both diesel and petrol engines and it works for an 8 cylinder engine. It is highly recommended to drain the coolant system before using the product.

  • Fixes various head gasket signs: it can fix overheating, backpressure, external leaks, water in the oil, and so on.
  • Works with a wide range of vehicles: it is compatible with cars, motorcycles, boats, trucks, and others.
PROS
CONS
  • Lifetime quarantee
  • Provides excellent results
  • Reliable brand
  • Fast results
VERDICT

This product is very efficient and is made by a respectable brand. It can be used for repairing multiple vehicles and it delivers great results every time. Additionally, it works fast and is compatible with diesel and petrol engines, making it a reliable companion for many car owners. We also like the fact that the manufacturer offers a lifetime guarantee.

BlueDevil Head Gasket Sealer

Made by a reliable brand, this sealer won’t disappoint you because it’s very efficient when it comes to sealing a leak up and simply forget about it. It’s suitable for petrol and diesel engines and it also works very well on trucks and vans. Besides the fact that this product is safe to use, you won’t encounter any problems in using it becomes it comes with comprehensive instructions that will guide you in achieving the perfect seal. Moreover, due to the fact that it doesn’t contain any solid or particulate matter, the engine won’t be expose at any risk. Since it provides permanent repairs of head gaskets, cracked heads, freeze plugs, this sealer is definitely a must-have in your vehicle repair kit. Additionally, the product is very popular among experienced car owners that recommend it to all those who want to rest assured in care they encounter a leakage or a crack.

PROS
CONS
  • Easy to understand instructions
  • Doesn’t affect the engine’s performance
  • Environment-friendly
  • 60 days money-back guarantee
VERDICT

BlueDevil Head Gasket Sealer is versatile as it works with all sorts of vehicles and engines. Using it is a breeze because it comes with the necessary instructions that will guide you step by step. Additionally, the product contains eco-friendly ingredients, being totally safe to use and efficient at the same time. Last but not least, in case you are not satisfied with the results, you can return it within 60 days from the purchase.

Bar’s Leak HG-1 Head Seal

With the help of this sealer, you’ll never have to worry about any kinds of leakages because it works perfectly every time. The great advantage of this particular product is the fact that it’s compatible with a wide range of engines, so it’s quite versatile from this point of view. Besides the fact that it can do a lot of repairs, the sealant is very easy to use if you follow the instructions. The brand that manufactured the product is specialized in producing superior anti-leak products that provide excellent results with minimum effort. According to the many customer’s review, the head gasket sealer provides excellent solution for a wide range of car related problems, being one of the most popular choices among those who want to invest in a high-quality product.

PROS
CONS
  • Versatile sealer
  • Easy to use
  • Reputable brand
  • Contains carbon fiber for remarkable results
VERDICT

Bar’s Leak HG-1 Head Seal was specially made to help you repair a wide range of cracks. Using it is very easy, especially if you follow the provided instructions, so with this product you don’t need mechanic skills to seal a head gasket. What we particularly like about this model is the fact that it contains carbon fiber, thus being very efficient every time needed.

CRC Permanent Head Gasket & Block Repair

Next on our list is the CRC Permanent Head Gasket, another great option if you are experiencing leakages or cracks. The product differentiates from the other ones available because it uses advanced nanotechnology to fill in cracks and crevices more efficiently than many similar products. The hard part in using this sealer is that you have to follow a more complicated process, so if you are not sure that you can properly handle it, you’d better stick to a simpler solution. However, the best part is that even though it’s more difficult to use, it provides durable bonds in your gasket without having to pay expensive repairs. Additionally, a great plus is that it’s made by a reputable brand that comes with a long history behind.

PROS
CONS
  • Uses nanotechnology for strong bonds
  • Great results for a longer period of time
  • Affordable price
  • Works on many vehicles
  • Requires more working skills
VERDICT

Although it provides excellent results, is not recommended to all car owners. Why is that? Well, simply because you have to be more careful when using this product, so there’s a great risk to apply it improperly. However, the advantage is that this formula is very efficient, so if you want a strong seal, you should definitely consider it as an option.

Bears True Blue Head Gasket Sealer

Unlike many sealers that may destroy the radiator or the cooling system of the car, this one promises to make wonders when it comes to blown head gaskets. This product has been released recently but it has gained the trust of the customers very fast. It was specially created to hold up for a long time, so is not just a temporary fix. The secret behind its performance is the fact that it was made by a chemist and mechanic who searched for the best formula. It works pretty fast and is easy to use. Along with the sealer, you will also receive the instructions which are very comprehensive. And the best thing is that this sealer comes with a special offer. Instead of one bottle, you will get 2.

PROS
CONS
  • Comes with understandable instructions
  • It is made by a chemist and mechanic
  • You will get a pack of 2 bottles
  • Fast results
  • Few informations related to the product
VERDICT

            You can confidently try this sealer if you want a long-term fix. According to the manufacturer, this formula won’t damage the radiator or heater core, so you can use it with confidence. The company offers a good customer service, so if you have any questions, the staff will gladly offer you all the information you need.

K&W FiberLock Head Gasket & Block Repair

If you want to always be prepared in case of a leakage, then you can confidently go with this sealer because it provides excellent long-lasting results. The fact that it’s compatible with all types of anti-freeze is a great advantage, being among the most popular choices of the customers. There’s no need to ask the help of a professional because the sealer offers a practical and effective solution to a wide range of car related problems. Also, using it is rather easy as it comes with simple to read and follow instructions, helping you get the best results. At the same time, the sealer works on all metal parts and many plastics and painted areas, so it’s quite versatile. Additionally, the formula includes military strength fibers nanotechnology for remarkable permanent repairs.

PROS
CONS
  • Uses military-strength fibers nanotechnology
  • Easy to use
  • Compatible with all types of anti-freeze
  • Less expensive
  • Some people claim that it may clog up the coolant system
VERDICT

K&W FiberLock Head Gasket & Block Repair is a great product as it offers long-lasting seals whenever necessary. Using it won’t pose any difficulties and you can use it for various repairs. We like the fact that it works with all types of anti-freeze and it comes at an affordable price, so you can confidently try it if you are looking for a trustful head gasket sealer.

Permatex 80063 High Tack Gasket Sealant

This sealant can be used for multiple jobs. It performs well when it comes to setting gaskets in place but you can also use it for fuel pumps, valve covers, and many others. It can resist temperatures between -65°F and 500°F, so you can buy it with confidence. It is highly resistant to gasoline, oil, propane, and others. Additionally, according to the manufacturer, this sealant is sensor-safe. Most people find it easy to apply but for the best results, it’s recommended to read the provided instructions. The many positive reviews of this product are a proof that it is highly efficient and provides a durable seal.

PROS
CONS
  • Great for multiple jobs
  • Provides the same efficiency under extreme temperatures
  • Easy to apply
  • Available at an affordable price
  • Dries up very fast
  • It is rather sticky, so make sure you wear gloves and protective clothes when using it
  • Strong-smelling
VERDICT

Nice option if you’re looking for an affordable yet efficient sealant. You will find it easy to use and it features fast-drying properties. This is a multi-purpose sealant, so it will come in handy for many jobs. However, it sticks to everything, so it’s best to wear protection clothes and gloves when using it. Also, it has a strong smell.

K-Seal ST3501

Used for multiple repairs, this product is a real helper when you need it the most. In order to make sure it really works, this formula was scientifically tested at the Brighton University. You can use the sealer with all water-cooled engines without having to flush or drain the cooling system. Also, it can be mixed with all types of anti-freeze and coolant. Another great thing is that you can add it to the overflaw tank and it will not clog. It is suitable not only for cars but also for small trucks and SUVs. In comparison to the original K-Seal formula this one delivers up to 33% more sealing power. This formula also offers anti-rust protection, which is really great. For best results, you have to shake the bottle for 30 seconds and then pour the content into the radiator. More information on how to use it are provided in the user guide or on the official website of the manufacturer. In case you are not satisfied with the results, you will receive your money back.

PROS
CONS
  • Has anti-rust and anti-freeze properties
  • Can be used with all water-cooled engines
  • Can be added to hot or cold engines or overflow tank
  • Money back guarantee
VERDICT

With an improved formula, the sealant does a great job when it comes to fixing cracked heads or blown head gaskets. It is very easy to use and was tested at Brighton University. In case you are not satisfied with the results, the manufacturer will send your money back.

ATP AT-205

This formula was specially designed to stop leaks quickly and inexpensively. It is suitable for a wide range of applications, including engines, power steering, transmissions, and so on. It works with both synthetic and conventional oils as well as hydraulic oils and many others. The ingredients are totally safe for the bearings and components and highly efficient – it contains the AT-205 plasticizer that renders hardness and flexibility. It doesn’t contain any petroleum distillates. The solution mixes with the oil and thus it circulates with it which means that it also restores the internal seals. In most cases – except when the gaskets is seriously damaged – the solution needs about 5 hours to reseal the leak.

PROS
CONS
  • Can also rejuvenate the internal seals
  • Doesn’t contain any dangerous substances
  • The bottle is sufficient to fix a 6-quart capacity
  • Contains the plasticizer AT-2015
VERDICT

This is a very effective resealer. We like the fact that it can be used to stop multiple leaks without any hassle. However, make sure you don’t use it on brake systems. The price is also convenient if we consider how expensive it to replace the gasket.

Product Ratings


All the products selected by us come with certain details that will help you compare them. The more you know about a certain product, the easier for you to choose what is best for your needs. In general, a customer has to know details like manufacturer or brand, weigh and so on.

  • Brand

    A brand with a good reputation is definitely a great option to go with. Gaining the trust of the customers is not an easy thing, but there are manufacturers that have succeeded in attracting more clients simply because they make durable and efficient products. A good reputation may be built in many years and a company has to always be committed to serving their customers. When it comes to head gasket sealers, among the most reliable ones are Steel Seal, BlueDevil Products, or K&W.

  • Weight

    The weight of the sealers is measured in ounces and it tells you how much quantity is in the bottle. For example, the Blown Head Gasket by Steel Seal weights 160 ounces, which means you will be able to repair more damaged gaskets than with the CRC Permanent Head Gasket & Block, which only weighs 32 ounces.

  • Container Type

    All the products come in a bottle, being easier to handle than other recipients. Usually, the bottles are made of durable plastic and they can be easily stored in your car’s trunk. On the bottle, you will find information about the ingredients used for manufacturing the sealer or about its uses.

  • Instructions Provided

    Knowing how to use the sealer will help you avoid any possible mistakes and get the best results. Usually, the instructions are provided on the back of the bottle or they may come separately.

Buying Guide


In case you’re looking for a quality product to seal a damaged gasket in your engine, you may consider some tips that will help you make the best decision. Since there are many products to choose from, things can become a little more complicated when you begin your search. For this reason, we have put together some guidelines to help you decide what’s best for your needs.

  • Make Sure It’s Efficient

    The most important thing you have to consider is the efficiency of the sealer because you need a performant product that is able to seal gaskets well. In order to find out if the product works well, you have to know what specialists and other customers think about the sealer. So, you can either ask the help of a professional or read some reviews of others customers. They’ve surely tested the product, so you will learn true facts for free.

  • Consider It’s Easy to Use

    An easy to use sealer simply means that it doesn’t require complicated applying procedures. In general, most products come with the instructions, but you have to make sure they are easy to understand. Nevertheless, if you have skills in repairing the car, you can opt for a product that may require more complicated procedures, but you have to be careful and follow the instructions.

  • Check the CompositionEven though there may be similarities between products, not all of them have the same composition, so learning more about the ingredients they are made of, will surely help you decide much easier. The most efficient ones are advanced formulas that are meant to provide fast and durable results, which is definitely an advantage.
  • Is It Safe for the Engine?

    Nobody wants to use products that can affect the functionality of their car, so making sure you buy a safe sealer for your vehicle’s engine is definitely something you shouldn’t neglect. Therefore, pay attention to the quality of the product and take into consideration the possible dangers you expose your car to.


All in all, the reviewed gasket sealers do a great job when it comes to fixing the leaking gaskets without too much hassle. Besides the fact that most of these formulas are easy to use, they also work very fast. Out top choice is Steel Seal Blown Head Gasket as there’s more quantity in the bottle, so you will be able to use it for a longer period of time. Additionally, this product is made by a respectable brand and it contains only premium ingredients. Next on our list is BlueDevil Head Gasket Sealer. This sealer definitely won’t disappoint you because is made of environmentally-friendly ingredients, being safe for both the environment and your engine. We also like CRC Permanent Head Gasket & Block Repair. It may be more difficult to handle but it provides long-term seals and is recommended by professionals.

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