The first commercially available sealant specifically formulated for automotive headlight sealing applications has now arrived. This premium headlight sealant is specifically formulated RTV (Room-Temperature-Vulcanizing) waterproof silicone sealant designed for use in reassembling automotive headlamp housings. The sealant has a tack time of 30 minutes and cures in three hours although six hours is recommended to insure a full cure.