Best Gasket Sealants

Powerful Application

This professionally-designed sealant applies to a variety of areas for versatile functionality without any hassle.

Purchase in single canister or multiple packs. Airtight applications on valve covers, rubbers corks, carburetors, and more. Leaves behind smooth tacky surface. Prevents damages from typical vehicle emissions.

31312 All-Purpose RTV Sealant

Must manually apply by brush, which may be frustrating for some users.

Best Bang for the Buck

J-B Weld

Easiest to Use

The compact bottle includes a detachable nozzle so that users can seal up tight areas with ease.

For a range of appliances, both indoors and outdoors. Waterproof seal resists damages from moisture and rain. Cures white so that users can enjoy a seamless look once finished. Adherable surfaces include ceramic, glass, and moldings.

440-B Gasket Sealer and Belt Dressing

Small tube may not be the best option for larger projects.

Gasgacinch

Weatherproof Pick

Designed for tough projects, this sealant resists extreme temperatures and conditions for long-lasting operation.

Powerful formula without being too inflexible or difficult to apply. Can be used on copper to natural rubber surfaces. Resists damages from high eat, gasoline, and oils. Remains flexible after drying.

81160 High-Temp Red RTV Silicone Gasket

Not as smooth of an application as some of the other products on this list.

Permatex

For Hotter Projects

With a specialized formula and narrowed nozzle, this is an excellent choice for sealing areas in hotter climates.

Formulated for higher temperatures. An excellent substitute to cut gaskets. Resists damages produced by heat such as shrinking or cracking. Dries quickly and on the spot. Won't spill over. Included nozzle for tighter finishes.

1111 Block Seal Permanent Head Gasket

Can be messy to use, so make sure to clean after each application.

Bar's Leaks

Blocks Leaks

Users can use this sealant to repair blown heads and other gaskets through this model.

Blocks leaks such as cracks in cylinder heads or blown head gaskets. Made of sodium silicate and antifreeze materials to prevent further cracks. Can replace broken products in cooling systems, transmission areas, and engines.