This 100 Percent acrylic resin coating forms a flexible layer over any fiberglass roof to protect and beautify. Dicor Fiberglass RV Roof Coating gives roofs a super bright white finish, which resists mildew and algae and reflects the sun's heat to help keep the interior cooler. Always use Dicor Fiberglass Clean and Prep and allow to dry before applying this Coating product. Two coats are required. One gallon of Dicor Fiberglass RV Roof Coating will cover 350 Square Feet per coat. Dicor Fiberglass Clean and Prep is designed for use on fiberglass RV roofs prior to coating the roof with Dicor Fiberglass Roof Coating. It is specifically formulated to remove oils, road grit and other contaminants and to enhance the adhesion of the roof coating.