Traditional Medium: Dries fast & waterproof for traditional acrylic techniques. Use with Atelier Interactive, other artists' acrylics or oil paints. For preparation of painting surfaces.A heavy, white acrylic ground with a high grit content, designed to provide a stable matte, surface on which to paint either for acrylic or oil painting.Can be applied straight from the container for thick textural interest in a painting.For a smooth finish, dilute and sand between coats.Clean up with mild soap & cool water. Water-Based & Non-Toxic.