J B Weld Ultimate Black Rtv Silicone Gasket Maker and Sealant 32329

These take the place of conventional paper, cork or rubber gaskets and usually are described as RTV (Room Temperature Vulcanizing). Vulcanizing is the process that cures the rubber in the sealant and usually requires high temperatures. Silicone sealants are useful in places where two machined surfaces meet without gasket i.e. between manifold exhaust and cylinder head.