Top 9 Head Gasket Sealer – Automotive Replacement Head Gasket Sets

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1. Bar's Leaks

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Bar's Leak HG-1 HEAD SEAL Blown Head Gasket Repair

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Bar's Leaks #ad - Seals cracked cylinder heads and blocks. Stops heater core and radiator leaks. Repairs blown head and intake gasket leaks. Fixes leaking freeze and core plugs.
BrandBar's Leaks #ad
ManufacturerBar's Leaks #ad
Height3.22 Inches
Length9.78 Inches
Weight2.65 Pounds
Width3.22 Inches
Part NumberHG-1
ModelHG-1
WarrantyManufacturer Warranty

2. BlueDevil Products

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BlueDevil Head Gasket Sealer 38386

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BlueDevil Products #ad - Safe and easy to use. Contains no solid or particulate matter that can harm a vehicles engine . Permanent Repair. Alternative solution for costly and time consuming repairs .
BrandBlueDevil Products #ad
ManufacturerBlueDevil Products #ad
Weight2 Pounds
Part Number38386
Model38386
WarrantyLIMITED WARRANTY

3. Bar's Leaks

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Bar's Leaks 1111 Block Seal Permanent Head Gasket Fix 24 oz.

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Bar's Leaks #ad - Seals cracked cylinder heads and blocks. Contains a combination of antifreeze compatible sodium silicate sealing liquid and various size gasket sealing particles which penetrate gaps & cracks and harden to permanently stop leaks. Repairs blown head gaskets. Stops block leaks.
BrandBar's Leaks #ad
ManufacturerBar's Leaks #ad
Height2.5 Inches
Length9.5 Inches
Width2.6 Inches
Part Number1111
Model1111
Warranty1 year manufacturer

4. K-Seal

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Radiator & Heater Core. A True Pour & Go, Cracked/Porous Blocks, Trade Trusted Stop Leak, K-SEAL Ultimate Permanent Head Gasket Repair ST3501 16oz Multi-Purpose Formula Stop Leaks in the Head Gasket

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K-Seal #ad - Scientifically tested: safe, effective, the repair withstands the high pressure of the combustion chamber, our head gasket and block repair seals leaks up to 1/32 of an inch! Once cured, all without failing or clogging the cooling system. Repairs in minutes: permanently fix blown head gaskets, cracked heads and cracked/porous blocks including aluminum heads in old and new cars.

Us bestseller. Customer support: if our head gasket repair leak doesn’t seal your intake gasket, the system might be over-pressurized. Seals cracks and stops leaks: a diy alternative to costly repairs, leaking radiator, freeze plug, our head gasket fix permanently seals cracks and holes! Quickly repair your blocks, heater core and water pump casing with no adverse impact on efficiency.

Check the technical Specification section of this page for extra instructions for a successful repair. Over 8 million bottles sold. Pour and go: our head gasket sealer is easy to use just shake, it mixes with all types of antifreeze, absolutely no draining, add to your radiator/overflow and run the engine! Unlike some competitive products, flushing or pulling the thermostat required. The only head gasket and block sealant that is 3rd party tested to meet ASTM D3147. Save time/money.
BrandK-Seal #ad
ManufacturerK-Seal #ad
Height8 Inches
Length2.5 Inches
Weight1 Pounds
Width2.5 Inches
Part NumberST3501ND
ModelKSLST3501
WarrantyLifetime warranty does not cover abuse

5. BlueDevil Products

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BlueDevil Pour-N-Go Head Gasket Sealer

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BlueDevil Products #ad - Easy to use Pour-n-go. Used for 4 cylinder and v-6 engines. Do-it-yourself Formula. Permanently seals Blown, Cracked or Leaking Head Gaskets.
BrandBlueDevil Products #ad
ManufacturerBlueDevil Products #ad
Weight1 Pounds
Part Number00209
Model00209

6. K&W

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K&W 401224 FiberLock Head Gasket & Block Repair, 32 Fl Oz

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K&W #ad - Contains 3 unique technologies. Seals larger holes with less fluid loss than competitive products as proven by lab test ASTM D6107. Easy pour and go formula! Permanently fixes head gaskets, cooling systems, engine blocks, and cylinder heads. Military-strength fibers create multi-layer repair over cracks with a web-like weave. Cool-x conditioner – lowers operating temperature as it circulates through cooling system. ". Nanotechnology permanently fixes the smallest cracks and crevices. Works with all antifreeze or plain water.
BrandK&W #ad
ManufacturerCRC #ad
Height9.54 Inches
Length3.4 Inches
Weight2.5 Pounds
Width3.4 Inches
Part Number401224-6
Model401224-6
Warranty2 year manufacturer

7. Permatex

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Permatex 80697 Copper Spray-A-Gasket Hi-Temp Adhesive Sealant, 9 oz. net Aerosol Can

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Permatex #ad - Fast-drying, prevents gasket burnout, metallic copper spray adhesive/sealant helps to dissipate heat, and improves heat transfer. Fills minor surface irregularities, fills hot spots and surface imperfections. Temperature range: -50°f to 500°f -45°C to 260°C. Resists all types of automotive fluids, especially gasoline. Suggested applications: Cylinder head gaskets, exhaust manifold gaskets, and other high temperature applications.
BrandPermatex #ad
ManufacturerPermatex #ad
Height6.38 Inches
Length2.63 Inches
Weight0.8 Pounds
Width2.63 Inches
Part Number80697
Model80697

8. STEEL SEAL

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Steel Seal, Head Gasket Sealer for 6 Cylinder Engines

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STEEL SEAL #ad - Award winning, triple-patented formula. Do-it-yourself pour in head gasket fix. Backed with a 100% Money-Back Guarantee. Used for all 6 cylinder engines 2 bottles. Permanently seals head gasket leaks.
BrandSTEEL SEAL #ad
ManufacturerSteel Seal #ad
Height8 Inches
Length4 Inches
Weight2.75 Pounds
Width4 Inches
Part Number6CYL001USA

9. CRC

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16 Oz, CRC K&W 401016 Block Seal Permanent Metallic Block & Radiator Seal

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CRC #ad - Withstands extreme pressure and temperatures of a cooling system and will not wash away. Professional grade formula exceeds ASTM D6107 for effectively sealing leaks in cooling systems. For use in all water-cooled diesel and gasoline vehicles. Seals cracks & holes in cast iron and aluminum engine blocks, head gaskets, and copper, freeze plugs, aluminum and bi-material radiators & heater cores. Permanent molecular seal that’s as strong as steel.
BrandCRC #ad
ManufacturerCRC #ad
Height2.13 Inches
Length5.87 Inches
Weight1.15 Pounds
Width2.31 Inches
Part Number401016
Model401016
WarrantyManufacturer Warranty