This surface protector seals, stiffens and provides surface tooth for painting surfaces. It is permanent, non-yellowing, flexible, and water resistant when dry. For use with oil, acrylic, pastels, and other paint media. Apply it to raw canvas, hardboard, paper, wood, and other non-oily porous surfaces. Sand hard, shiny surfaces before applying. Can be tinted with acrylic colors but is not to be mixed with oil paints. This package contains 473-milliliter of gesso. Conforms to ASTM D4236