Tested and trusted by the professionals to finish every project with confidence!The first commercially available adhesive specifically formulated for automotive headlight sealing applications has now arrived. This premium headlight sealer 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.