Table of Contents
- View The Best Head Gasket Sealer Below
- 1. J-B Weld Ultimate Copper Silicone Gasket Maker and Sealant
- 2. Steel Seal Blown Head Gasket Fix Repair Sealer
- 3. Permatex Indian Head Gasket Shellac Compound
- 4. Permatex High Tack Gasket Sealant
- 5. ATP Automotive AT-205 Re-Seal Stops Leaks
- 6. Permatex Copper Spray-A-Gasket Adhesive Sealant
- 7. K-SEAL Coolant Leak Repair
- 8. Bar’s Leak 1100 Head Gasket Repair
- 9. K&W FiberLock Head Gasket & Block Repair
- 10. BlueDevil Head Gasket Sealer
- Head Gasket Sealer Buyer’s Guide
- What to Look for When Buying a Head Gasket Sealer
- Type of Head Gasket Sealer
- Compatibility with Anti-freeze
- What are the Signs of a Blown Head Gasket?
- How Does a Gasket Sealer Work?
- Should You Replace the Head Gasket or Apply a Sealer?
A head gasket replacement is one of the most expensive repairs for any car owner. The availability of a more affordable option is a welcome idea, especially if the car does not have a blown head gasket. Head gasket sealers have become a go-to alternative as a result, because they are less expensive and nearly solve the problem.
The sealer consists of a chemical liquid that circulates in the engine to seal the leaks on the head gasket keeping your car in top-notch condition for the next few months. As such, getting the best head gasket sealer is critical to prevent leaks on your engine. While there are numerous products in the market, they don’t all deliver the best results. Our experts created a list of the ten best head gasket sealers highly recommended by car owners, auto technicians, and drivers.
View The Best Head Gasket Sealer Below
1. J-B Weld Ultimate Copper Silicone Gasket Maker and Sealant
J-B Weld company is known for making the best adhesives, and this Silicone gasket sealer is no exception. It is made from silicone material, and it is easy to apply on a variety of surfaces. Being an RTM (Room Temperature Vulcanized) material, it can be used on mechanical assemblies that operate on high continuous temperatures of 550-650F.
The head gasket sealant cures pretty fast to create a strong bond even on tough surfaces. Since it is an anti-freeze sealant, it forms a waterproof seal of surfaces as soon as it is exposed to the moisture in the air. The product is also resistant to weathering, cracking, shrinking, and it is sensor-safe.
J-B Weld head gasket sealer is a versatile product that can be used on a variety of surfaces including exhaust manifolds, automotive head gaskets, oil pans, water pumps, drive housings, and oven doors.
+ Cures rapidly
+ Creates weather-resistant seal
+ Can be used on a variety of surfaces
+ Can be used on an electric car as it is sensor safe
+ Suitable for DIY applications too
Why We Like It – It is the best head gasket sealer for mechanical assemblies that operate on high temperatures (550-650). After use, the product forms a waterproof seal that does not crack even at high temperatures.
2. Steel Seal Blown Head Gasket Fix Repair Sealer
Steel Seal head gasket sealer is the best for a second-hand car, an old truck, and a car with larger engines. It has a premium value and for a good reason. First, it provides a solution for blown head gasket problems like white smoke, watery oils, and external leaks.
Secondly, Steel Seal head gasket sealer is effective on older engines with just one application. The product does not contain particles that lead to engine blocks or buildup on the tubes, causing more engine problems. Motorists, however, need to flush the system before pouring in the sealer. It can be an inconvenience for people looking for a quick gasket fix.
+ Can be used on gasoline and diesel engines
+ Easy to use
+ Cures rapidly
+ The best for large engines
+ Has a 100% money-back guarantee
Why We Like It – Once applied, the product seals cracks and breaches quickly, creating a long-lasting seal. Even when exposed to high temperatures, the seal does not crack. We also found Steel Seal Head Gasket sealer the best for diesel and gasoline engines.
3. Permatex Indian Head Gasket Shellac Compound
Looking for a head gasket seal that gives you value for your monies? Then Permatex Shellac Compound is the best buy. It has a slow-drying formula to allow the user to assemble parts without feeling rushed. The compound is designed to adhere to a range of materials, including rubber, cork, and plastic gaskets.
The product has a pretty vast temperature range, i.e., 65-350F hence suitable for application on hot and cold engines. Additionally, it is resistant to most shop fluids and diesel fuels.
+ Can adhere to different materials
+ Can be used as a lubricant
+ Resistant to auto shop fluids
+ It is affordable
Why We Like It – We found this Shellac sealant from Permatex rather versatile as it could be used on automotive and aviation applications. What’s more, apart from its obvious function as a sealer, you can use it as a lubricant during an emergency.
4. Permatex High Tack Gasket Sealant
It is the best head gasket sealer for general purpose applications. With a temperature range of -65 to 500F, it can be used on cold and hot engines, and other components like fuel pumps, valve covers, manifold gaskets, composite gasket, and carburetors.
The product dries pretty fast to form a firm, tacky film that seals and holds cuts gaskets during assembly. Permatex High tack sealant is resistant to butane, gasoline, kerosene, and anti-freeze. However, since it is sensor safe, it can be used in an electric car.
+ Fast-drying formula
+ Vast temperature range
+ Remains tacky
+ Resistant to kerosene, gasoline, propane, and anti-freeze
Why We Like It – We found the product’s adhesiveness rather unique as it causes the sealer to stick to the surface for a long time. Also, the resulting tacky film makes it easy to remove
5. ATP Automotive AT-205 Re-Seal Stops Leaks
The Atp AT-205 head seal is an excellent buy for buyers looking for a product to fix minor leaks. It is easy to use and seals cracks and holes pretty fast. The product also makes an excellent sealer for rubber leaks in an old car. It rejuvenates the seals, hydraulic systems, and the power steering causing them to function with fresh energy.
The beauty of this head gasket sealer is that it is compatible with gear oils, power steering oils, and synthetic oils, so you don’t need to flush them out before using the product. Most users worry that the sealant will affect the chemical composition of other car fluids, but it is not the case with ATP AT-205 stop leak.
For optimal results, use the product when changing the engine oil. Also, be sure to drive the car for a few minutes after applying the product to prevent it from dissolving the paint, which develops into clogs.
+ Straightforward application
+ Best for sealing rubber seals and small leaks
+ Does not have petroleum distillates
+ Compatible with synthetic oils
Why We Like It – ATP Automotive does not contain petroleum distillates, which is pretty impressive for a head gasket sealer designed for minor leaks. Petroleum distillates cause rubber seals to break down and swell interfering with the effectiveness of the sealer.
6. Permatex Copper Spray-A-Gasket Adhesive Sealant
The sealer not only seals cracks in the coolant system but also prevents gasket burnout, dissipates heat, and improves heat transfer thanks to the copper metal used in its formulation. It also has a fast-acting formula that ensures the cracks seal instantly after application.
The copper formula also gives the product the vast temperature range of -50-500F. As such, you are confident about using the sealer on both cold and hot engines. Additionally, it has a spray-on design, which makes it easy to apply and distinguishes it from other products on the list.
+ Best for sealing dry surfaces (non-absorbent)
+ Easy to remove
+ Prevents corrosion
+ Resistant to fluids
Why We Like It – We loved the Permatex spray sealer as it could be applied on a variety of surfaces including cylinder head gaskets, exhaust manifold gaskets, carburetor gaskets, among other high-temperature applications.
7. K-SEAL Coolant Leak Repair
K-Seal is one of the best head gasket sealers used by AA, an international roadside rescue company. The product gets to work immediately. Once poured into the radiator, seal every coolant leak and crack. The product has been made from a unique formula that contains microfibers. Once they come into contact with the crack, they bond to form a permanent seal.
As such, the sealant can permanently seal radiators, including those made from aluminum and plastic in both old and new vehicles. K-SEAL can also be used on hot and cold engines, so you don’t have to purchase a different product.
Additionally, the coolant is compatible with all types of anti-freeze products; thus, you don’t have to flush or drain the cooling system before use. This head gasket sealer can be used to repair the freeze plug, water pump casing, and the heater core without affecting their efficiency.
+ The seal can withstand high pressure
+ Does not clog the cooling system
+ Does not flushing
+ Can seal large cracks
Why We Like It – K-Seal is the best head gasket sealer for use on large cracks. Customers attested it could perform a leak repair on a hole as wide as 0.635mm, which is pretty impressive. It is also the only sealer that meets ASTM D3147 standards.
8. Bar’s Leak 1100 Head Gasket Repair
The sealer not only repairs blown head gaskets but also protects your engine from overheating. The manufacturer has used a revolutionary formula that provides a permanent solution for radiator and heater core leaks. The formula contains a blend of refractory and aramid fibers, which create a durable and waterproof layer on the cracked area.
The particles penetrate the cracked head gasket and lock together to form a hard, permanent seal. What’s more, the sealer does not need specialized training to apply it. The company’s team of chemical engineers create products that can be used by pros and non-professionals.
You only need to pop the bottle open, lift the hood, and pour the liquid into the head gasket. The product can be used on any engine as long as it has anti-freeze properties. What’s more, with the Bar’s Leak hg-1 head gasket sealer, you only need to wait out for 15 minutes before resuming your journey. You can use the product to fix freeze plugs, engine blocks, and leaks too.
+ Seals the leaks permanently
+ Short downtime (15 minutes only)
+ Can be used on any engine
Why We Like It – It is the best head gasket for people looking for products that don’t need flushing or expertise before use. Also, we found this sealer pretty economical as one bottle could treat an engine with a capacity of two and a half gallons. A four-cylinder engine only needed half a bottle of the sealer.
9. K&W FiberLock Head Gasket & Block Repair
If you’re looking for a multi-functional sealer, the K&W head gasket repair sealant is the best buy. It can seal and repair car engine parts and you can use it as an anti-freeze canister. What’s more, it is compatible with anti-freeze products and can be used to seal leaks in the radiator, heater cores, cylinder heads, coolant leaks, head gasket, and freeze plugs.
This head gasket sealer also provides a pretty convenient solution for a quick leak repair as you will be able to drive your car within an hour. Additionally, the K&W FiberLock formula is made from military-grade fiber nanotechnology that creates a permanent seal. It also contains a Cool-X conditioner that enables the product to seal the cracks even at a low temperature.
+ Military-grade nanotechnology
+ Can be used with all kinds of anti-free and plain water
+ Can seal painted surfaces too
+ Easy to use
+ Creates a permanent seal
Why We Like It – This adhesive-style head gasket sealer is the best for the non-professional mechanic looking to repair a gasket valve without visiting the dealer’s shop. It can be used in a car, SUV, pickup truck, and boats too.
10. BlueDevil Head Gasket Sealer
The Bluedevil sealer is your best buy if looking for a low-priced quick fix head gasket fix for four and six-cylinder engines. This professional-grade head gasket sealer not only seals the head gasket but also leaks associated with the cooling system, including freeze plugs, heater cores, and the radiator core.
The 32-ounce bottle is suitable for small and medium-sized engines providing a permanent seal on a range of materials including plastic, cast iron, aluminum, among other kinds of metal. The formula can also repair cracked heads, so you no longer need to worry about coolant leaks. For optimal results, flush out the old coolant and pour in the fresh product before using the sealant.
+ Lasts long (9-10 months)
+ Does not cause the engine to overheat
+ Can be used on cracked cylinder heads too
+ No harmful chemicals
+ Can be used on gasoline and diesel engines
Why We Like It – We loved the fact that this head gasket sealer could repair cracked cylinder heads too. Such leaks can prevent the right amount of coolant from flowing to the engine, causing it to overheat. Bluedevil head gasket sealer makes a great quick fix sealant.
Head Gasket Sealer Buyer’s Guide
What to Look for When Buying a Head Gasket Sealer
With the different types of head gasket sealers in the market, it is essential to look for one that suits the needs of your engine. Earlier variations were formulated using wood pulp, but modern sealants comprise of chemicals with the ingredients contingent on the product. Here’s a round-up of some things to look for when buying a head gasket sealer:
Gas and diesel engines have different ignitions, starter motors, and outputs, hence the need to purchase a compatible head gasket. Some sealers are compatible with both types of engines, while others are formulated for either gasoline or diesel-powered engine. Check the label before purchasing the product to ensure it is compatible.
Ease of Use
The product should be easy to pour into the radiator. If you don’t intend to visit a professional workshop to help you seal the gasket, then you should buy a product that provides clear instructions on how it seals leaks. The most common involves pouring the product into the radiator and following it up with an anti-freeze product.
Once the sealant is poured into the radiator, you can’t operate the car for a specified period. Factor in the amount of time you need to wait out for the sealant to settle down before use. Some products require an hour, while others take longer based on the radiator capacity.
Bar’s Leak hg-1 sealant takes the least time (15 minutes) to seal the head gasket. However, if you have time and you are patient enough to wait for the product to dry, don’t shy away from buying sealers that take longer to cure.
The quantity is usually measured in the ounces, with the least ranging from eight ounces to several gallons. Buy a product that provides enough sealant for the problem at hand. A 16-ounce sealant is adequate for small engines with blown head gaskets. It would also help if you carried an additional container for emergencies.
Head gasket sealers have different instructions you should follow before use. For example, some brands need the coolant flushed out before pouring in the sealant while others require the thermostat removed and re-installed. Factor in your ability to use the product before purchase.
Type of Head Gasket Sealer
Knowing the different types off head gasket sealers in the market is critical to making the correct purchase. There are seven types:
Shellac: This type is also known as the Indian Head and is commonly produced by Permatex Company. The sealer has been formulated for sealing thin paper or cardboard gaskets operating in low temperatures (between 300-350F) and low pressure. The sealers are also resistant to motor fluids, and most technicians also use them to mount differential, thermostat, and timing cover gaskets. The Shellac sealer is also easy to remove
Gasket Makers: The sealers are available in three variants; the fast-drying and fast-hardening, non-hardening, and slow-drying. Each kind forms a seal that can hold up to temperatures of up to 400F. The first kind is used to block expansion plugs, install threaded connections, and form seals between metal-to-metal flanges. Slow-drying sealers are the best for sealing neoprene transmission pan gaskets and cork oil pan gaskets.
High tack sealers: This non-drying head gasket sealer can be used just as the shellac sealers only that it can hold up to higher temperatures, i.e., 500F. High tack sealers are also resistant to propane, kerosene, and diesel fuel
RTV and Ultra RTV silicone sealers: The sealers are suitable for surfaces that operate at temperatures as high as 750F. They are available in various colors and formulations, including spray cans, caulk-gun style cartridges, and tubes. The colors symbolize the heat tolerance of the product. RTV silicone sealers with red and orange colors, for example, can hold up to temperatures of 650F, gray, blue, and black are best for head gaskets that heat up to 500F. Products with copper-like colors can hold up to temperatures of 750F. Ultra RTV silicone sealers are the best for a modern electric car
Anaerobic: The sealers are usually packaged in a tube. They are best used where there are no sources of external air to assist in drying. Manufacturers developed them in a bid to cater to OEM applications where non-corrosive gaskets are used. They are also ideal where no replacement is available
Copper: This type is ideal for head gaskets. The sealer contains a metal that dissipates heat and facilitates even heat distribution between mating surfaces. Copper sealers can hold up to temperatures of 500F and are easy to remove
Hylomar: It is a new type of sealant in the market and is commonly used by OEM manufacturers. Its formula comprises a polyester urethane-based compound that can tolerate temperatures as high as 500F. It does not set and remains tacky for easy assembly and disassembly. It is this feature that makes Hylomar sealers ideal for racing applications where regular adjustments are made on the hood.
Compatibility with Anti-freeze
Check the sealer for compatibility with the anti-freeze product on your car. If you purchase a product that is not compatible, you may need to flush out the radiator before pouring in the sealant.
Purchase a product that creates a long-lasting seal. While the extent of damage affects its longevity, the sealant should be strong enough to hold up to the rigors of the engine.
1. Do head gasket sealers work?
Yes, they do, once the product is poured into the radiator, you will notice that some head gasket problems like overheating disappear. The chemicals in the product repair the leaks in the head gasket and harden during internal combustion to complete the head gasket repair.
2. What is the best head gasket sealer to use?
J-B Weld Ultimate Copper Silicone Gasket Maker and Sealant is the best. It combines a range of desirable features in one product, so users don’t need to purchase additional products. First, it contains silicone, a component known to maintain stability in high and low temperatures. Silicone sealants are also resistant to moisture, other chemicals and weathering making J-B Weld pretty effective when used to repair blown head gaskets. Also, its anti-freeze features mean that you don’t need to purchase a separate product.
3. How long does the head gasket sealer last?
Even the best head gasket sealers don’t have a defined economic life. It depends on several variables, including the number of leaks and the condition of the head gasket. The type of sealer you use matters too. Some sealants contain chemicals that wear out rapidly while other kinds provide permanent seals.
4. Is Blue Devil bad for your engine?
No, it is the best sealer for repairing leaks in two and four-cylinder engines. It can repair leaks in other components like the heater cores and freeze plugs. However, you need to flush out the coolant before pouring a Bluedevil sealant.
What are the Signs of a Blown Head Gasket?
A faulty head gasket causes the seal between the engine block and the cylinder head compression to get damaged. As a result, fuel and gases leak into places they don’t usually flow. The coolant and engine oil also leaks into the combustion chambers disrupting the combustion process and leading to irreversible damage to the sensors, pistons, and spark plugs. It is challenging to identify a faulty head gasket, hence the need to look out for the following signs:
White smoke emitted by the exhaust tail: The white smoke is produced by the coolant that flows into the cylinder when the engine is switched off. This is because, during the combustion process, the coolant evaporates manifesting as water vapor smoke
The coolant is mixing with engine oil: When the coolant flows to the cylinder head, it passes through the leaking joint to the oil pan, mixing with the engine oil. A white-like oil with a distinct smell is produced as a result
Low compression on the cylinders: A leak between the engine block and the cylinder manifests in the form of an engine misfire. It is a result of the air and fuel pressure in one of the cylinders reducing and causing inefficient burning of the fuel
How Does a Gasket Sealer Work?
A head gasket sealer separates the engine block and the cylinder head. It is installed to prevent oil and water from leaking into other car parts. Gasket sealers are available in three forms, i.e., paste, glue, and spray.
Should You Replace the Head Gasket or Apply a Sealer?
The head gasket sealer only provides a temporary solution to the problem. As such, it is ideal for repairing minor leaks. However, if the car has a blown head gasket, it would help if you replaced it.
The best head gasket sealer should repair the leaking parts of a cooling system by creating a permanent seal. Our top choice J-B Weld Ultimate Copper Silicone Gasket Maker and Sealant is the best for car owners looking for silicone-based sealants with anti-freeze properties. Motorists looking to repair blown head gaskets in large and old engines will find the Steel Seal Blown Head Gasket Fix Repair.
The sealer is pretty effective. It comes in two bottles for a price tag, which is pretty reasonable if using it on an eight-cylinder engine. However, if you are shopping on a tight budget, the Permatex Indian Head Gasket Shellac Compound is a great buy. It can repair all the leaks and double up as a lubricant in case of emergencies.