We Use CookiesWe use cookies to enhance the security, performance,
functionality and for analytical and promotional activities. By continuing to browse this site you
are agreeing to our privacy policy
10 Best Head Gasket Sealers 2025 in the United States
#1
Winner
Permatex 82180 Ultra Black Maximum Oil Resistance RTV Silicone Gasket Maker, Sensor Safe And Non-Corrosive, For High Flex And Oil Resistant Applications 3 oz
The Permatex 82180 Ultra Black Maximum Oil Resistance RTV Silicone Gasket Maker is a solid choice for anyone looking to create or replace gaskets in various automotive applications. Its non-corrosive formula is sensor-safe and offers superior adhesion, making it particularly effective on oily surfaces. This feature is a big plus, especially for users working on tasks involving engine oil or transmission fluid, as it ensures a durable and long-lasting seal. The gasket maker operates effectively within a broad temperature range of -65°F to 500°F, which enhances its versatility in different automotive environments.
Customer Highlights
A summary of real customer reviews to highlight what shoppers are saying!Customer Highlights
A summary of real customer reviews to highlight what shoppers are saying!#2
K-Seal ST5501 Multi-Purpose One Step Permanent Coolant Leak Repair, 8oz, Pour and Go, Mixes with All Antifreeze, No Flushing Required
The K-Seal ST5501 Multi-Purpose One Step Permanent Coolant Leak Repair is designed to provide a quick and effective solution for engine coolant leaks, making it ideal for car and light truck owners who need a fast fix. One of its greatest strengths is its ease of use; you simply shake the bottle, pour it into the coolant system, and run the engine without needing to drain or flush the system. This makes it a convenient option for those who may not be mechanically inclined.
Customer Highlights
A summary of real customer reviews to highlight what shoppers are saying!Customer Highlights
A summary of real customer reviews to highlight what shoppers are saying!#3
Permatex 80019 Aviation Form-A-Gasket No. 3 Sealant, 4 oz.
The Permatex 80019 Aviation Form-A-Gasket No. 3 Sealant is a versatile product suitable for both aviation and automotive applications. One of its major strengths is its wide temperature tolerance, ranging from -65F to 400F, making it effective under various conditions. Its slow-drying and non-hardening properties ensure flexibility, which is beneficial for close-fitting machined surfaces and solid gaskets.
Customer Highlights
A summary of real customer reviews to highlight what shoppers are saying!Customer Highlights
A summary of real customer reviews to highlight what shoppers are saying!Top 10 Best Head Gasket Sealers 2025 in the United States
#1
Winner
9.7 score
Permatex 82180 Ultra Black Maximum Oil Resistance RTV Silicone Gasket Maker, Sensor Safe And Non-Corrosive, For High Flex And Oil Resistant Applications 3 oz
Permatex 82180 Ultra Black Maximum Oil Resistance RTV Silicone Gasket Maker, Sensor Safe And Non-Corrosive, For High Flex And Oil Resistant Applications 3 oz
Compatibility: various automotive uses
Temperature Tolerance: -65°F to 500°F
Curing Time: 24 Hours
Ease of Application: user-friendly
Durability: long-lasting seal
Chosen by 1178 this week
K-Seal ST5501 Multi-Purpose One Step Permanent Coolant Leak Repair, 8oz, Pour and Go, Mixes with All Antifreeze, No Flushing Required
K-Seal ST5501 Multi-Purpose One Step Permanent Coolant Leak Repair, 8oz, Pour and Go, Mixes with All Antifreeze, No Flushing Required
Compatibility: All antifreeze, engines up to 12 cylinders
Ease of Application: Shake, pour, run engine
Durability: Permanent repair
Permatex 80019 Aviation Form-A-Gasket No. 3 Sealant, 4 oz.
Permatex 80019 Aviation Form-A-Gasket No. 3 Sealant, 4 oz.
Compatibility: aviation and automotive
Temperature Tolerance: -65F to 400F
Curing Time: slow-drying
Ease of Application: brush-top
Durability: resistant to gasoline, oil, grease
Permatex 80697 Copper Spray-A-Gasket Hi-Temp Adhesive Sealant, 9 oz. net Aerosol Can , Orange
Permatex 80697 Copper Spray-A-Gasket Hi-Temp Adhesive Sealant, 9 oz. net Aerosol Can , Orange
Compatibility: Cylinder head gaskets, exhaust manifold gaskets
Temperature Tolerance: -50°F to 500°F (-45°C to 260°C)
Ease of Application: Spray form, even coverage
Durability: Copper material, heat transfer
K-Seal ST5516 Heavy-Duty Multi-Purpose One Step Permanent Coolant Leak Repair, 16 oz, Pour and Go, Mixes with All Antifreeze, No Flushing Required
K-Seal ST5516 Heavy-Duty Multi-Purpose One Step Permanent Coolant Leak Repair, 16 oz, Pour and Go, Mixes with All Antifreeze, No Flushing Required
Compatibility: all antifreeze types
Ease of Application: shake, pour, and go
Durability: long-lasting repair
Related Products
BlueDevil Products 38386 Head Gasket Sealer - 1 Quart
BlueDevil Products 38386 Head Gasket Sealer - 1 Quart
Compatibility: Gasoline and diesel engines
Ease of Application: No special tools needed
Durability: Permanent seal
K-Seal ST3501 Pour and Go Head Gasket Sealer, 16oz, Permanent Repair for Blown Head Gaskets, Cracked Heads and Blocks
K-Seal ST3501 Pour and Go Head Gasket Sealer, 16oz, Permanent Repair for Blown Head Gaskets, Cracked Heads and Blocks
Compatibility: All coolants and engine materials
Ease of Application: No draining, shake, pour, go
Durability: Permanent, durable, long-lasting
Permatex 30300 Head Gasket Repair - Multi-Purpose Stop-Leak, 16 fl. Oz, Seals Head Gaskets While Preventing Future Leaks
Permatex 30300 Head Gasket Repair - Multi-Purpose Stop-Leak, 16 fl. Oz, Seals Head Gaskets While Preventing Future Leaks
Compatibility: all types of anti-freeze
Curing Time: adequate time to cure
Ease of Application: one-step process
Durability: durable nature
BlueDevil Products 00209 Pour-N-Go Head Gasket Sealer - 16 Ounce
BlueDevil Products 00209 Pour-N-Go Head Gasket Sealer - 16 Ounce
Compatibility: gasoline and diesel
Ease of Application: easy to apply, no special tools
Durability: permanent seal for leaks
#10
7.1 score
Bar's Leaks 1109 Block Seal Liquid Copper Intake and Radiator Stop Leak - 18 oz.
Bar's Leaks 1109 Block Seal Liquid Copper Intake and Radiator Stop Leak - 18 oz.
Compatibility: Works with all coolant types
Ease of Application: Pour directly into radiator
Durability: Durable seal on various materials
How do we rank products for you?
Our technology thoroughly searches through the online shopping world, reviewing hundreds of sites. We then process and analyze this information, updating in real-time to bring you the latest top-rated products. This way, you always get the best and most current options available.
Buying Guide for the Best Head Gasket Sealers
Choosing the right head gasket sealer is crucial for ensuring the longevity and performance of your vehicle's engine. A head gasket sealer is used to fix leaks in the head gasket, which is a critical component that seals the engine block and cylinder head. When selecting a head gasket sealer, it's important to consider several key specifications to ensure you get the best product for your needs. Understanding these specifications will help you make an informed decision and avoid potential engine damage.CompatibilityCompatibility refers to whether the head gasket sealer is suitable for your specific engine type and materials. This is important because using an incompatible sealer can lead to ineffective sealing or even damage to your engine. Sealers are often designed for specific types of engines, such as gasoline or diesel, and materials like aluminum or cast iron. To pick the right one, check your vehicle's manual or consult with a professional to ensure the sealer matches your engine's requirements.
Temperature ToleranceTemperature tolerance indicates the range of temperatures the sealer can withstand without breaking down. This is crucial because the engine operates under high temperatures, and a sealer that can't handle the heat will fail. Sealers typically have a specified temperature range, and you should choose one that exceeds the maximum operating temperature of your engine. For most vehicles, a sealer with a high-temperature tolerance is preferable to ensure durability and effectiveness.
Curing TimeCuring time is the amount of time it takes for the sealer to fully set and create a solid seal. This is important because a longer curing time means your vehicle will be out of commission for a longer period. Sealers can have curing times ranging from a few hours to a full day. If you need a quick fix, opt for a sealer with a shorter curing time. However, for a more permanent solution, a longer curing time might be more effective.
Ease of ApplicationEase of application refers to how simple it is to apply the sealer to the head gasket. This is important because a product that is difficult to apply can lead to improper sealing and further engine issues. Some sealers come in a liquid form that you pour into the radiator, while others may require more complex application methods. If you're a DIY enthusiast, look for a sealer with straightforward instructions and minimal tools required. For more complex applications, professional assistance might be necessary.
DurabilityDurability measures how long the sealer will last once applied. This is crucial because a durable sealer will provide a long-term solution to head gasket leaks, reducing the need for frequent reapplications. Durability can be influenced by the quality of the sealer and the conditions under which it is used. For a lasting fix, choose a sealer known for its long-lasting properties and positive reviews from other users.