Some rubber roofing materials require special cements and coatings manufactured for use on these materials alone. Black Jack 6230 Wet/Dry Plastic Roof Cement.Black Jack #99 Neoprene SuperFlash Flashing Cement.The products designed for wet weather application include: Thinning a product designed as ready-to-use can impact performance, and thinning certain products may violate government Volatile Organic Compound (VOC) regulations.Ĭan I apply Black Jack coatings or cements if it will rain soon? Can Black Jack products be thinned and if so, with what type of thinner?īlack Jack products should not be thinned unless labels expressly direct so.