#1500 Black Rustproofing Compound is a thixotropic asphalt/wax complex coating for use in interior cavities and underbodies of automobiles, trucks, and trailers.  The dried film is a firm, non-tacky, semi-gloss finish.  When applied to interior cavities (holes dried-direct spray method), the material will creep and penetrate without dripping.  Dries in 2-4 hours.