1 Gallon. Rosco Flexcoat is a flexible, nontoxic, water-based coating for polyurethane foam, Styrofoam, and ethafoam. Its 100% acrylic formulation provides excellent adhesion to a wide variety of substrates. Flexcoat contains no plasticizers, so it will not be brittle withage or exterior exposure. It is compatible with all Rosco paints used either as tints or surface coatings. Flexcoat is weatherproof and flame retardant, providing one coat protection for all of your theatrical applications; available in gallon jugs or five gallon pails.