A head gasket sealer works when you pour it into the radiator. You run the car for about 15 to 30 minutes, with the heater and fan on high. Then the special chemicals in the sealant work via heat.

Head gasket sealer can get out out of a jam until you can replace the gasket. Photo credit: David Traver Adolphus / Au ...

Gasket thickness requirements depend on sealing-face tolerances and fastener spacing. Two machined-flat mating surfaces seal with thin gaskets because the gaskets only make up for small tolerances.

Looking for a head gasket sealer? Our team of experts narrowed down the best head gasket sealers on the market. Read this review and save yourself time and money.

Never use a urethane sealer/adhesive because it will bond windshield, gasket, and body into one and you will have a very tough time replacing the windshield later on. See All 2 Photos.

United Gasket and its subsidiary, Gaskoa, Inc., have a long-tenured history serving a diverse range of industries, including electronics, rail, non-engine auto, HVAC, pumps and lighting.