ThreeBond Grey Gasket Maker is a one-component, room-temperature vulcanizing (RTV) sealant. It is a high viscosity product that cures when exposed to air. The cured material has superior adhesion and elongation properties. ThreeBond RTV is oxygen sensor safe and will not corrode metal surfaces.
ThreeBond Grey RTV is also specified by part number in most service manuals, because ThreeBond also supplies the OEs with a similar formulation for use on the assembly line.