10 Best Gasket Sealer of December 2025

• Reliable, fast-drying, all-purpose sealant dries to a highly tacky, non-brittle film; remains tacky indefinitely
• Tacky paste for holding cut gaskets in place during assembly; helps seal cut gaskets
• Resists gasoline, oil, antifreeze, axle lube, kerosene, propane and butane; sensor-safe
• Temperature Range: -65°F to 500°F (-54°C to 260°C)
• Suggested Applications: Valve covers, fuel pumps, carburetors, manifold gaskets; seals any rubber, cork, paper or composite gasket

Permatex

• Slow-drying, non-hardening sealant approved for use in aviation as well as automotive applications
• Designed for dressing/sealing cut gaskets on flexible/stamped parts
• Allows for easy disassembly if required; resists gasoline, oil and grease
• Temperature Range: -65F to 400F (-54C to 204C)
• Suggested Applications: Valve cover gaskets, and oil pan gaskets

Permatex

• HI TEMP RED SILICONE GASKET MAKER & SEALANT: Is an RTV (Room Temperature Vulcanized) Silicone gasketing material, designed for use in mechanical assemblies where the existence of higher, continuous temperatures up to 550º F or 650º F intermittent might exist
• COUNT ON US: For more than 40 years, our products have earned a loyal following from people who take pride in their work. With each product we innovate, we continue to provide the world's strongest bond for your projects
• EASY TO USE: Curing when the product is exposed to the moisture in air, it forms a tough, waterproof seal on most surfaces. It will not shrink or crack, resists weathering and is sensor safe
• VERSATILE & DEPENDABLE: Ideal for automotive, metal, oil pans, exhaust manifolds, water pumps, timing covers, differential covers, drive housings and oven doors
• DO IT YOURSELF: Big or small, you can DIY it with J-B. Our heavy duty adhesives repair & restore it right the first time. JB Weld delivers the legendary performance of the World's Strongest Bond

J-B Weld

• Repairs blown head and intake gasket leaks
• Seals cracked cylinder heads and blocks
• Stops heater core and radiator leaks
• Fixes leaking freeze and core plugs

Bar's Leaks

• Sensor-safe, noncorrosive RTV silicone gasket material formulated specifically for water pumps and thermostat housings
• Highest water-glycol resistance available in an RTV silicone
• Superior adhesion and flexibility; can be used as a gasket maker or dressing
• Temperature Range: -65°F to 500°F (-54°C to 260°C) intermittent
• Suggested Applications: Water pump and thermostat housings

Permatex

• Stops block leaks
• Seals cracked cylinder heads and blocks
• Repairs blown head gaskets
• 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.

Bar's Leaks

• Formulated for hi-temp applications, or heavy-duty use
• Replaces almost any cut gasket, and coats pre-cut gaskets to increase reliability
• Makes reliable 'formed-in-place' gaskets that resist cracking, shrinking and migrating
• Temperature range of -65F to 650F intermittent
• Suggested Applications: Valve covers, oil pans, timing covers, water pumps, thermostat housings, transmission pans

Permatex

• Designed specially for high-torque and high vibration applications
• Maximum vibration resistance, with outstanding resistance to oils, cooling and shop fluids
• OEM specified, guaranteed not to leak
• Low odor and non-corrosive formula
• Suggested Applications: Valve covers, oil pans, intake manifold end seals, timing covers, water pumps, thermostat housings

Permatex

• Sensor-safe, non-corrosive formula designed for superior adhesion to oily surfaces and long term durability
• 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
• Temperature Range -65°F to 500°F (-54°C to 260°C) intermittent
• Suggested Applications: Valve covers, oil pans, intake manifold end seals, timing covers, and differential covers
• Fit Type: Universal

Permatex

• Gasgacinch Gasket Sealer and Belt Dressing provides unmatched gasket sealing properties, preventing leaks, reducing expensive repairs, and creates a superior grip as a belt dressing
• Gasgacinch Gasket Sealer remains flexible and makes it easier to assemble and disassemble an engine or transmission, often any residue may be removed simply by rubbing it away
• Adheres to carbon steel, alloy steel, aluminum, titanium, lead, magnesium, synthetic and natural rubber, copper and cork, and may be used in hot, cold, wet, dry, acid, basic, and abrasive environments
• When cured, Gasgacinch is flexible, has high-peel strength, high-shear strength, fatigue resistant, vibration dampening, high heat resistance, gasoline resistant, and oil resistant
• Preferred in nearly all mechanical industries including: auto repair, diesel and truck repair, high-performance engine builders, motorcycle repair and many more

Gasgacinch