LOCTITE® SI 5999 is a grey, thixotropic, oxime silicone sealant paste intended for gasketing design, service, manufacture and rebuild tasks in automotive powertrain applications. As a thixotropic product, migration of the liquid is reduced after application to the substrate. It is non-corrosive and blow-out resistant. The product cures by room temperature vulcanizing and is tack-free in minutes.