Bumper and Cladding Adhesion Primer is an advanced, solvent-based coating designed to permanently stick to the bumpers, side cladding, and trim found on many of today's cars, trucks, and SUV's. As everyone knows, most bumpers are made from plastics that are very difficult to get anything to stick to. Bumper and Cladding Adhesion Primer WILL stick to raw TPO and polypropylene. Once the primer is on, your basecoat-clearcoat will stick.