RTV Engine Sealant is a one-component, room-temperature vulcanizing (RTV) sealant. It is a high-viscosity engine sealant that cures when exposed to air. The cured material has adhesion and elongation properties and is effective even on large gaps. It is very resistant to engine oils and coolants, will not corrode metals and is blow-out resistant. This engine sealant is also oxygen-sensor safe. This product comes in a cartridge for easy, large-scale application and requires a conventional caulking gun.