A gasket sealant, also known to many as a head gasket sealer is a vital car part found in many vehicles types. Its primary purpose is to separate the cylinder head and the engine block. With this description, it is safe to say that every vehicle's gasket sealer is found lying between the cylinder head and engine block. It is placed in vehicles to prevent oil and water from entering places they're not supposed to by sealing the joint between both car parts. To help reduce the number of fluid packages, most gasket sealers come in the form of glue, paste, or spray.