LAST UPDATED: December 18, 2018

The Best Gasket Sealers (Review) in 2021

Best Choice best gasket sealer ATP Automotive Re-Seal Stops Leaks
Premium Pick premium pick gasket sealer Steel Seal Blown Head Gasket Fix Repair Sealer
Best Value best value gasket sealer Permatex 81160 High-Temp Red RTV Silicone Gasket

To hinder any leakage from occurring from or into the joined surfaces when under compression, a gasket is one vital mechanical seal needed in every vehicle. Getting the best gasket sealer is thus, the best resort riders must utilise to keep their gaskets safe from all forms of leakages permanently. Even though there are numerous models of gasket sealers currently on the market, not all of them deliver quality service. In the list below we review ten of our favourite and best gasket sealers which are highly recommended by many drivers, car owners and professionals in repairs.

The Best Gasket Sealer

A safe, fast and highly effective sealant that promises to act as the ultimate stop-leak for all gaskets and rubbers is the ATP AT-205 Re-Seal Sealer. Is it one of the popular products recognised by many riders and professionals in different parts of the world. It comes in an 8 oz. container but carries a capacity of 6 quartzes. It is just magnificent and is your next best option when it comes to purchasing a gasket sealant. This product stops all leaks at a rapid rate, as it has been formulated to offer a professional level of strength as it performs its function as a fast-acting sealer.

Professionals formulate this head gasket sealer and many individuals who have experience in the operation of all kinds of vehicles; thus, the AT-205 can be used to rejuvenate all gaskets and rubber seals found in varying parts of any car such as the power steering, engines, hydraulic systems, transmissions and differentials. The formula also ensures that there is no breakdown or over-swelling of your seals since it doesn’t contain any petroleum distillates. The AT-205 is compatible with both synthetic and conventional oils, power steering fluids, ATF, hydraulic oils and gear oils. It is an exclusive formula specially created to help restore all worn or dried out seals, without posing any threat or harm to internal bearings and components.

Key Features
  • Fast acting resealer
  • Compatible with conventional and synthetic oils
  • Will not over-swell or breakdown seals
  • Permanent sealer solution
Specification
  • Brand ATP Automotive
  • Model AT-205
  • Weight 2 pounds

Permatex is one brand known by many. They are a group of like-minded individuals who believe in the creation of innovative and cost-efficient products that meet the daily needs of riders and drivers. Their love for the welfare of their consumers has led them to continually provide the right gasket maker for all your applications, with the Permatex 81160 Silicone Gasket being a typical example. If you’re in need of a product specially developed for use on heavy-duty vehicles such as the tow truck, then this might be your ideal choice. Not only has it been formulated for high-temperature applications, but the Permatex Gasket sealer also can take the place of any cut gasket with ease. 

To increase its reliability, this engine block sealer doesn’t only replace your cut gasket, it also coats all your pre-cut gaskets, and resists the occurrence of shrinking, cracking and migrating by creating reliable ‘formed-in-place’ gaskets of high resistance. Some of the areas in which this sealer can be applied include thermostat housings, oil pans, valve covers, water pumps, transmission pans and timing covers. With a temperature range between -65 degrees Fahrenheit and 650 degrees Fahrenheit, this engine block sealer can resist auto and shop fluids. It carries an OEM specification since it’s a member of the first generation gasket makers in existence between 1970 and 1980. An outstanding oil resistance, sensor-safe properties and excellent torque retention are but a few of the many significant performance advantages that Permatex has been created to offer every rider. It is one of the special superior RTV silicone gasket sealers formed as a solution to the use of new materials such as bi-metal alloys, aluminium and high-tech plastics, extended warranties and engine sensors used by many new vehicles.

Key Features
  • Formulated for heavy-duty use
  • Replaces almost any cut gasket,
  • Temperature range of -65F to 650F
  • Mixes with any kinds of antifreeze
Specification
  • Brand Permatex
  • Model 81160
  • Weight 3.84 ounces

To hinder any leakage from or into the joined surfaces while under compression, vehicles need a very critical mechanical seal, popularly referred to by many as the gasket. Utilising the best gasket sealer that will permanently seal all your leakage is an act that must be undertaken to keep your gasket safe from any form of leakage. The BlueDevil Head Gasket Sealer comes to your rescue as one of the best options made available to you in the market currently. It is a safe product to apply, as it doesn’t pose any harm to the engine of your vehicle. Your engine is kept safe because this gasket sealant contains no solid or particulate matter. The BlueDevil product is used by riders looking for a more permanent solution to their gasket issues.

Numerous riders chose a great alternative solution for time-consuming and costly repairs, and this sealer is the best product you need to try out. This blue devil head gasket sealer is relatively affordable and cheap, despite it being one of the high performing gasket sealers on the market today. You wouldn’t want to miss a product that enables you to solve all your gasket issues after only one round of usage.

Key Features
  • Safe and easy to use
  • Permanent Repair
  • Contains no solid or particulate matter
  • Alternative solution time-consuming repairs
Specification
  • Brand BlueDevil Products
  • Model 38386
  • Weight 2.87 pounds

A brand that understands their clientele and continuously listens to their needs and worries is extremely rare. It is these companies that appeal to the masses as all their products are representative of almost everything the everyday person will need. They listen to their customers and provide them with innovative solutions that are most often, affordable to all. The 3M company is one of such companies. They are a diversified team of people with various skills working together to provide their clients and their communities with services and products that are innovative and affordable. They also respect the need for us to protect our environment for the upcoming generation and all other ages to follow. It is for this reason, and more than the 3M Ultrapro Silicone Gasket Tube is made from a premium grade silicone compound for form-in-place gaskets.

This gasket sealer is suitable for applications that reach a temperature of up to 600 F, and it’s been designed for automotive usage. It can be used to seal all firewalls, floor pans, shock absorber mounting towers, trunk seams, fuel filler splash pans, around wheel wells, and taillight openings. This oxygen sensor safe product from 3M features six per case features and just like other products created by 3M, contribute significantly to sustainable development through social responsibility and economic progress. 

Key Features
  • Oxygen sensor safe.
  • Designed for automotive use,
  • Premium grade black silicone compound
  • 6 per case features
Specification
  • Brand 3M
  • Model 08672
  • Weight 3.2 ounces

The Aviation Form-A-Gasket sealant from Permatex is another one of their various exceptional sealants found on the market today. Permatex offers riders with a broad range of gasket sealants that can be used on multiple year models of both domestic and imported vehicles with different performance calibres when a chemical gasket is not an option. This Permatex sealant is a non-hardening and slow-drying brush-top sealant that has been formulated to resists substances such as oil, gasoline and grease. With a temperature range starting from -65F and ending at 400F, this gasket sealant has been approved for use in automotive applications and aviation, and it can be applied onto sealing hoses, close-fitting machined surfaces and solid gaskets. 

The ability of this Permatex sealant to freely resist grease, oil and gasoline helps reduce the occurrence of your leakage being permanently blocked. This feature makes the Permatex sealant one of the best gasket sealers ever formulated. Its wide temperature range also makes it a highly effective and reliable Permatex model. Considered by many as an extremely important gasket sealer, the Permatex sealer is recommended by many professionals for use on various vehicle parts such as the surfaces of the close-fitting machine, the solid gaskets, sealing hoses and many more. All these parts have been identified due to the versatile nature of the Aviation Form-A-Gasket sealer. Since it doesn’t harden as it dries, this gasket sealant can be applied with a brush. 

Key Features
  • Non-hardening and slow drying brush-top sealant
  • Resistant to oil, gasoline and grease
  • Temperature range of -65F to 400F
  • Aviation approved
Specification
  • Brand Permatex
  • Model 80019
  • Weight 1.62 pounds

The benefits owners of vehicles receive from the Gasgacinch 440-A Gasket Sealer are numerous. The manner in which this product helps reduce expensive repairs, prevent leaks, and provides a superior grip when acting as a belt dressing cannot be compared to any other gasket sealer. The sealing properties of the Gasgacinch sealer are currently also unmatched, making it the ultimate level of quality and perfection in the market of gasket sealers. This head gasket repair liquid helps to make the assembling and disassembling of the engine or transmission easier by remaining flexible. Whereas many gasket sealers require the use of a solvent or some form of scraping detrimental to your engine to remove any residue, the Gasgacinch residues can be removed just by rubbing it away.

Copper, natural rubber, cork, carbon steel, aluminium, magnesium, titanium and lead are some of the materials this sealant has been formulated to adhere to this, and it has the versatility for a broad range of applications many other sealants do not possess.  No matter your environment, be it cold, hot, acid, dry, abrasive or primary, the Gasgacinch sealant may be used with no issue. Once your Gasgacinch is cured it becomes your superhero in every sense by having a high peel strength, increased flexibility, resistance to fatigue, high-shear strength, high resistance to heat, vibration dampening as well as resistance to oil and gasoline. To prevent the development of leaks which often occurs when a sealer seeps into the small crevices of a metal surface, the Gasgacinch features a liquid composition when other sealants are thick and pasty. The Gasgacinch and all its positive benefits make it a product highly preferred in nearly all mechanical industries such as diesel repair, tuck and auto repair, motorcycle repair, high-performance engine builders and many more.

Key Features
  • Unmatched gasket sealing properties
  • Adheres to various materials
  • May be used in different environments
  • No heat retaining metal powders
Specification
  • Brand Gasgacinch
  • Model 440-A
  • Weight 1.12 ounces

To ensure that all gaskets used in a manifold installation are properly sealed, you must make use of the Edelbrock 9300 Gasgacinch Gasket Sealer. To allow for easy removal of parts during disassembly, you must coat the cylinder head surface and the gasket surface with a sealer, during the installation of the intake manifold gaskets. This coating must be done before any part is placed into position. The Edelbrock sealer comes in a re-sealable 4-ounce container and has been formulated to have oil and water resistance, making it useful on oil pans, water pumps and valve cover gaskets.

One of the considerations one must look at before the purchase of any blown head gasket repair sealer is how pocket-friendly it is, regarding its price. Going for affordable products is always advised, but you must ensure that the product, though reasonably priced will guarantee you a high-quality performance, just like the Edelbrock sealer. This head gasket repair liquid is used as a permanent sealer for all the gaskets employed in a manifold installation. This is a top product you must get your hands on, especially with its primary mode of usage. You only realise what you’ve been missing when you start to use this gasket sealer today. The best feature of the Edelbrock sealer is that it makes disassembly extremely easy after sealing since this gasket sealer doesn’t harden after its applied. 

Key Features
  • Water and oil-resistant
  • Comes in re-sealable 4-ounce containers
  • Not for sale in Catalina Island
  • Allows easy gasket removal during parts disassembly
Specification
  • Brand Edelbrock
  • Model 9300
  • Weight 4.8 ounces

There’s yet another engine block sealer from the most recognised brand in the market currently, Permatex. The Permatex 80011 Form-A-Gasket sealant comes with a formula that is non-hardening and slow-drying, meant to help you efficiently seal stamped parts and cut gaskets. With a ranging temperature of -65F to 400F, this sealer can easily resist common shop fluids and fuels while offering many riders with a sealer suitable for applications on both imported and domestic vehicles of any performance calibre or model year. The non-hardening nature of this gasket sealant enables you to disassemble when required, and this is great for cases where sealing is more important than adhesion.

Designed to offer you a permanent and instant solution, the Permatex sealer is recommended for many applications as it can be used to block all leakages that pose as a threat to your engine. It can be used with ease on the oil pan gaskets and valve cover gaskets since it is grease and oil resistant. This Permatex sealer is highly effective. Even though it dries at a slow pace, it still prevents the occurrence of leakages, and this had made it a favourite amongst many riders and vehicle professionals. 

Key Features
  • Resistant to gasoline
  • Non-hardening
  • Slow-drying
  • Allows for easy disassembly if required
Specification
  • Brand Permatex
  • Model 80011
  • Weight 4.8 ounces

Don’t let the words “blown head gasket” scare you, the Bar’s Leaks 1111 Head Gasket Fix is right here with you. We all hate having to part with our cars for a couple of days, all in the name of a blown head gasket. Fixing such an issue, we all know, requires quite a massive amount of money and time spent away from our vehicles. Since we never really plan for such occurrences, finding extra cash for such a problem can prove to be extremely difficult. With the Bar’s Leaks sealant, fixing your blown gasket can be done in your garage, by yourself. This sealer is easy to use and ensures that car is back on the road in less than an hour.

All head gasket fix solutions offered by Bars Leak head gasket fix are easy, fast, affordable and highly effective. To permanently stop leakages, this head gasket stop leak sealant contains a combination of antifreeze-compatible sealing liquid formulated with sodium silicate as well as various gasket-sealing particles. This mixture can penetrate cracks and gaps, and once it hardens, it can stop all leakages permanently. With over two million bottles sold globally, this liquid technology sealer is counted on by many individuals for damaged, leaking or blown gasket heads. Don’t let a blown gasket head side-line your entire life, and don’t spend thousands at a shop when you can get this product for a couple of dollars.

Key Features
  • Seals cracked cylinder heads and blocks
  • Repairs blown head gaskets
  • Stops block leaks
  • Works on all Cars, Trucks, Vans & SUV’s
Specification
  • Brand Bar's Products
  • Model 1.6 pounds
  • Weight 1111

Another permanent solution to your blown head gasket and the final one on our list is the Steel Seal Blown Head Gasket Fix Repair Sealer. This is an exceptional DIY repair product formulated to help repair cracked heads, freeze plugs and heater cores. With this best choice sealant, you can undertake the repair of a six or eight-cylinder engine with ease. As compared to all sealants mentioned in this article, the Steel Seal Sealer is the most expensive. The price is however justified with its performance. The liquid gasket delivers on its promise to give your repair job a strong “seal just like a steel” effect. Following the application instructions is extremely easy, and you’re not required to have any background knowledge in mechanical treatment like an engineer.

The Steel Seal sealant is a versatile product developed by fellow car owners and car professionals who know exactly what is needed to repair a blown gasket head correctly. With a 97% performance rating from car owners and car experts, the Steel Seal gasket sealant comes with a money-back guarantee that happens to play if you don’t like its performance.

Key Features
  • Backed with a 100% Money-Back Guarantee
  • Used for 6 or 8 Cylinder Engines
  • DIY Pour in Head Gasket Fix
  • Very versatile
Specification
  • Brand Steel Seal

Best Gasket Sealer Buying Guide & FAQ

What to Consider When Buying a Gasket Sealer

There are some criteria that the best head gasket sealer must meet before you select or finally pick it as your preferred choice from the lot. You should only buy this sealant if it meets all the criteria listed below.

  • Ease of implementation:

Any gasket sealer you choose to purchase must be super easy to use. There are many methods of application concerning the use of a gasket sealant, but the most common involves a one-step application where you can pour your preferred sealer into your radiator and follow shortly with an antifreeze product. Before purchase, it is critical to ensure that your sealer helps you make use of the easiest implementation method of the gasket sealant to your radiator.

  • Waiting time:

Depending on the size of your vehicle’s radiator and its capacity, the amount of waiting time for complete healing of the head gasket sealer will vary. If possible, be on the lookout for sealants with short healing time, such that you will be able to drive your car or undertake other types of operations at least, after an hour of pouring in your product.

  • Compatibility:

The gasket sealer selected must be compatible with all vehicle types such as trucks, SUVs, cars and all four-wheeled vehicles.

  • Balancing mode:

Look out for the average long lasting balancing mode of your gasket sealer after repairing it. Most often, the extent of damage dramatically affects how long the repair will last.

car engine parts

Symptoms of Possible Head Gasket Failure

  • Overheating under your hood.
  • No leakage traces, while your 5 coolant level steadily depletes.
  • Whitish tint of smoke, blowing from your exhaust.
  • Bubble formations in the overflow compartment and radiator.
  • External coolant leaks from beneath the exhaust gasket.

Head Gasket Sealer Vs Replacement of the Gasket

Using a head gasket sealer is a more temporary and cost-effective method, as compared to a permanent head gasket repair. The former is an ideal temporary solution for when you experience a gasket failure. If your vehicles gasket head is blown totally, it’ll be more practical to replace it completely, and this is where the latter can be undertaken. Both methods, however, are equally great considerations to be made by riders.

Best Gasket Sealer FAQ:

Q: What is gasket sealer and how does it work?

A gasket sealant, also known to many as a head gasket sealer is a vital car part found in many vehicles types. Its primary purpose is to separate the cylinder head and the engine block. With this description, it is safe to say that every vehicle’s gasket sealer is found lying between the cylinder head and engine block. It is placed in vehicles to prevent oil and water from entering places they’re not supposed to by sealing the joint between both car parts. To help reduce the number of fluid packages, most gasket sealers come in the form of glue, paste, or spray.

Q: What is head gasket failure?

The overheating of the engine of a vehicle is one of the common problems many riders face, and many of them have no clue as to how it comes about. The leak and rift of the cooling system and the head gasket is often the primary cause of overheating. Starting up the gasket sealer is one of the popular solutions to this problem, which is why many drivers are always in need of such a product.

Another gasket failure trigger is the reduced cooling system of many vehicles. Believe it or not, it is never a wise decision to make use of an acidic coolant, as it tends to erode the gasket and ultimately cause leakage between the compression unit and the refrigerants passing way. The result of this is your car leaving you stranded on a hot Monday morning on the highway. Many riders refer to this type of gasket failure as “Blown Head Gasket”.

Q: How to fix head gasket failure?

Fixing a gasket sealer is an easy thing to do. With many well-known gasket sealers found in the market that are not only time saving but affordable, this is a great and highly efficient way of solving your gasket failure issues. If you’re not conversant with the application process, it is advised that you contact a professional to help you. Most often it takes 2-3 days for your head gasket to be permanently replaced. This method is recommended when your gasket is completely blown, but if it’s just a failure, the use of a gasket sealant is an excellent choice.

Q: Is the sealer a permanent solution for a blown head gasket?

For a blown gasket, the number and condition of the leaks in existence will determine whether a sealer can be your permanent solution. A head gasket sealer should work excellently for minor leaks for up to six months. Using a sealer in the case of a significant leak, however, is not considered an excellent go-to solution. Most major leaks are better solved by permanently replacing your head gasket sealer.

engine gaskets

Our Top Pick

Our first choice of best gasket sealer is the ATP Automotive Re-Seal Stops Leaks. Popularly recognised all around the world, this is one of the safest and highly effective sealants found on the market. It has been formulated to stop all leakages at an extraordinarily fast rate and is used for the rejuvenation of all rubber and gasket seals found in engines, power steering and hydraulic systems, as well as other vehicle parts. Its exclusive formula makes it compatible with both conventional and synthetic oils, ATF, gear oils, power steering fluids and hydraulic oils. Lastly, it is an exceptionally safe product that poses no harm or threat to internal component and bearing of your vehicle.

Sources:

  1. How to Use Engine Block Sealer to Repair a Head Gasket Leak – YourMechanic
  2. How to Fix a Head Gasket With Engine Block Sealer – wikiHow