Non-hardening gsaket sealer/maker and thread sealant, 100 gram tube. Hylomar is a non-hardening polyurethane based compound which is impervious to gasoline, oil or any motorcycle related fluid. Use as a gasket maker, gsaket dressing, or thread sealant. Hylomar goes on the surface like a jelly and in just minutes, Hylomar turns to a putty and is ready for assembly. Becasue of its Velcrolike ability, it can be reused and reassembled.