Top 10 Head Gasket Sealant – Automotive Replacement Head Gasket Sets

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1. Bar's Leaks


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

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

2. Permatex


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

Permatex #ad - Fills minor surface irregularities, fills hot spots and surface imperfections. Fast-drying, metallic copper spray adhesive/sealant helps to dissipate heat, prevents gasket burnout, and improves heat transfer. 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

3. BlueDevil Products


BlueDevil Head Gasket Sealer 38386

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

4. Bar's Leaks


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

Bar's Leaks #ad - Stops block leaks. 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.
BrandBar's Leaks #ad
ManufacturerBar's Leaks #ad
Height2.5 Inches
Length9.5 Inches
Weight0 Pounds
Width2.6 Inches
Part Number1111
Warranty1 year manufacturer

5. K-Seal


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

K-Seal #ad - Repairs in minutes: permanently fix blown head gaskets, cracked heads and cracked/porous blocks including aluminum heads in old and new cars. Save time/money. Scientifically tested: safe, 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, effective, all without failing or clogging the cooling system.

Pour and go: our head gasket sealer is easy to use just shake, it mixes with all types of antifreeze, add to your radiator/overflow and run the engine! Unlike some competitive products, absolutely no draining, flushing or pulling the thermostat required. Customer support: if our head gasket repair leak doesn’t seal your intake gasket, the system might be over-pressurized.

Check the technical Specification section of this page for extra instructions for a successful repair. Us bestseller. 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. Over 8 million bottles sold. The only head gasket and block sealant that is 3rd party tested to meet ASTM D3147.
BrandK-Seal #ad
ManufacturerK-Seal #ad
Height8 Inches
Length2.5 Inches
Weight1 Pounds
Width2.5 Inches
Part NumberST3501ND
WarrantyLifetime warranty does not cover abuse

6. Permatex


Permatex 82180 Ultra Black Maximum Oil Resistance RTV Silicone Gasket Maker, 3.35 oz. Tube

Permatex #ad - Superior resistance to powertrain fluids including engine oil, transmission fluid, gear lube and coolants. Retains high flexibility and eliminates the need for pre-formed, pre-cut, paper, rubber or cork gaskets; OEM specified and approved for dealership warranty requirements. Fit type: Universal. Suggested applications: Valve covers, oil pans, intake manifold end seals, timing covers, and differential covers. Sensor-safe, non-corrosive formula designed for superior adhesion to oily surfaces and long term durability. Temperature range -65°f to 500°f -54°C to 260°C intermittent.
BrandPermatex #ad
ManufacturerPermatex #ad
Height8 Inches
Length1.38 Inches
Weight0.1 Pounds
Width3.81 Inches
Part Number82180

7. Bar's Leaks


Bar's Leaks 1100 Head Gasket Repair, 20 oz.

Bar's Leaks #ad - Stops block leaks. Repairs blown head gaskets. Head gasket sealant is not compatible with antifreeze and must only be added to the cooling system after ALL ANTIFREEZE has been flushed and removed. Seals cracked cylinder heads and blocks. Dual action 2 part formula — liquid ceramic: liquid penetrates large and small leaks to form a seal actually harder than the original head gasket — REINFORCED FIBERS: Fiber additives lock together with liquid to increase strength and promote a permanent seal.
BrandBar's Leaks #ad
ManufacturerBar's Leaks #ad
Height8.3 Inches
Length1.8 Inches
Weight1.41 Pounds
Width3.4 Inches
Part Number1100
Warranty1 year manufacturer

8. K&W


K&W 401224-6 FiberLock Head Gasket & Block Repair, 32 Fl Oz

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

9. J-B Weld


J-B Weld 32325 Ultimate Copper 3 Ounces High Temperature RTV Silicone Gasket Maker and Sealant

J-B Weld #ad - It will not shrink or crack, resists weathering and is sensor safe. Easy to use: curing when the product is exposed to the moisture in air, it forms a tough, waterproof seal on most surfaces.

Jb weld delivers the legendary performance of the World's Strongest Bond. Versatile & dependable: ideal for automotive, differential covers, oil pans, water pumps, exhaust manifolds, timing covers, metal, drive housings and oven doors. Choose the product pros trust for your project. Our heavy duty adhesives repair & restore it right the first time. Do it yourself: big or small, you can diy it with j-b.

Hi temp silicone gasket maker & sealant: is an rtv silicone gasketing material, designed for use in mechanical assemblies where continuous temperatures up to 550º F or 650º F intermittent exist. What the professionals use: builders, mechanics & repair pros know our products bond strong to a variety of surfaces in even the toughest environments.
BrandJ-B Weld #ad
ManufacturerJBWeld #ad
Height6 Inches
Length6 Inches
Weight0.09 Pounds
Width9 Inches
Part Number32325
WarrantyNo Warranty

10. Permatex


Permatex 80062 High Tack Gasket Sealant, 4 oz.

Permatex #ad - Tacky paste for holding cut gaskets in place during assembly; helps seal cut gaskets. Reliable, all-purpose sealant dries to a highly tacky, fast-drying, non-brittle film; remains tacky indefinitely. Suggested applications: valve covers, cork, manifold gaskets; seals any rubber, fuel pumps, carburetors, paper or composite gasket. Resists gasoline, axle lube, kerosene, antifreeze, oil, propane and butane; sensor-safe. Temperature range: -65°f to 500°f -54°C to 260°C.
BrandPermatex #ad
ManufacturerPermatex #ad
Height2.75 Inches
Length2.44 Inches
Weight0.3 Pounds
Width2.44 Inches
Part Number80062