Atelier Gesso Primer is a water-based, acrylic ground with a high grit content. Designed to provide a stable white surface with a pleasant tooth (non-slippery) surface to paint on. Gesso promotes good paint adhesion and prevents loss of moisture into the substrate for both acrylic and oil paintings. Appearance: White heavy liquid with high grit content. Dries white. High viscosity. Use directly from the container with no dilution required.