Adhesion Promoter - 12 Ounce Spray Can - Use on Hard to Sand Areas and Before applying Truck Bed Liner (Pack of 6)12 ounce Aerosol Spray Can Ready to use Adhesion Promoter that creates great adhesion to surfaces to allow great adhesion for the following topcoats to be applied. Custom Coat Adhesion Promoter is Ideal for all automotive surfaces such as plastics, aluminum, fiberglass, galvanized and painted surfaces. Replaces the need to abrade surfaces in difficult to access areas and hard to sand areas Easy to apply to create Superior bonding properties, Top coat