32 oz. (quart) size. Gamblin Oil Painting Ground makes a strong, bright, non-absorbent foundation for oil paintings. Gamblin Ground is formulated from alkyd resin, titanium dioxide, and calcium carbonate – titanium dioxide gives opacity, while calcium carbonate gives tooth for strong adhesion. Gamblin Ground makes a brighter and less-absorbent ground layer compared to acrylic gesso, meaning that oil paint layers on top retain better color saturation. Gamblin Ground can be applied to a pre-primed acrylic gesso canvas or panel to make a good painting support a great one.