I used UPOL Gravitex (grey for the external areas and black for interior). The Raptor bed liner is 2 part polyurethane product that can be tinted body colour... not the same stuff though, the Gravitex is one part (solvent suspension) and retains some flexibility. It appears to be very similar to the product Porsche used on later 911 bodies, so probably the same composition as the original Wurth.