Black Box Polymer Paint Sealant 16 oz Bottle Black Box Polymer Paint Sealant for auto paint protection has the longest protection of any modern car wax. The complex, cross linked polymers protect paint and metal from UV damage while leaving a slick finish. A single application will protect metal, fiberglass and painted surfaces from future UV damage (oxidation) A single application will protect metal, fiberglass and painted surfaces from future UV damage (oxidation)