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Head Gasket Sealers

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

Permatex

9.7 score

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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!
Compatibility
The product is sensor-safe and non-corrosive, allowing confident use without damaging delicate electronic components.
Ease of Application
The Permatex 82180 Ultra Black Gasket Maker offers exceptional performance with perfect consistency, making it easy to apply and ideal for various projects.
Durability
High flexibility makes it perfect for high-flex applications like intake manifolds or exhaust systems, maintaining a durable seal under extreme vibrations.
#2
9.4 score

K-Seal ST5501 Multi-Purpose One Step Permanent Coolant Leak Repair, 8oz, Pour and Go, Mixes with All Antifreeze, No Flushing Required

17%OFF

K-Seal ST5501 Multi-Purpose One Step Permanent Coolant Leak Repair, 8oz, Pour and Go, Mixes with All Antifreeze, No Flushing Required

K-Seal

9.4 score

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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!
Curing Time
Magic potion worked for me. It worked instantly and I haven't had a problem since.
Ease of Application
Can't believe how easy it was to do. Just pulled the radiator hose, poured in the K-Seal, and reinstalled the hose.
#3
9.2 score

K-Seal ST3501 Pour and Go Head Gasket Sealer, 16oz, Permanent Repair for Blown Head Gaskets, Cracked Heads and Blocks

34%OFF

K-Seal ST3501 Pour and Go Head Gasket Sealer, 16oz, Permanent Repair for Blown Head Gaskets, Cracked Heads and Blocks

K-Seal

9.2 score

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The K-Seal ST3501 Pour and Go Head Gasket Sealer is designed for permanent repair of blown head gaskets, cracked heads, and engine blocks. One of its standout features is its compatibility with all types of coolants and a wide range of vehicle engine materials, making it versatile for various applications, including heavy-duty machinery. The sealer boasts an advanced formula with 33% more sealing power, utilizing ceramic micro-fibres to seal leaks up to 0.64mm, ensuring a durable and long-lasting repair.

Customer Highlights

A summary of real customer reviews to highlight what shoppers are saying!
Compatibility
The K-Seal really worked wonders on my Jeep Wrangler's coolant leak, holding up solidly for weeks and hundreds of miles without any issues.
Curing Time
Despite initial skepticism, the K-Seal completely stopped the coolant leak in my Chevy 5.7 after a second application and cold soak, making it a promising solution for severe leaks.

Top 10 Best Head Gasket Sealers 2025 in the United States

#1

Winner

9.7 score

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Permatex

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

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Chosen by 1236 this week

#2

9.4 score

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K-Seal

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

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17% OFF
#3

9.2 score

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K-Seal

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

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34% OFF
#4

8.9 score

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BlueDevil Products

BlueDevil Products 38386 Head Gasket Sealer - 1 Quart

Compatibility: Gasoline and diesel engines
Ease of Application: No special tools needed
Durability: Permanent seal

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25% OFF
#5

8.6 score

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Permatex

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

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Related Products

#6

8.3 score

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Permatex

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

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#7

8.0 score

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K-Seal

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

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#8

7.7 score

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BlueDevil Products

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

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#9

7.4 score

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Permatex

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

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#10

7.1 score

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Bar's Leaks

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

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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.

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