TremPro® 645 is a high performance, single-component, medium-modulus, neutral-cure silicone sealant. TremPro 645 cures to a flexible rubber when exposed to moisture present in the air. Basic Uses; TremPro 645 is specially designed for sealing joints between most non porous materials such as glass, aluminum, metal and metal alloys. Typical applications include: recreational vehicles, truck trailers and cabs. Features and Benefits: TremPro 645 is easily gunnable over a wide range of temperatures and has excellent adhesion to most common substrates without the use of a primer. Superior handling and tooling characteristics when compared to other silicones. Superior skin time and excellent ultraviolet resistance and movement capabilities.