Grumbacher Gesso (Hyplar) Artists' Acrylic & Oil Paint Medium, 32 oz. Jar Surface prep medium For use before oil and acrylic painting; Made in USA May be tinted with acrylic colors but do not mix with or apply over turpentine or oils; May be thinned with water Can be applied to multiple porous surfaces, such as canvas, wood, cardboard, plaster, and concrete Not appropriate for egg tempera or gilding