Golden Artist Colors GAC 800 is a low-crazing extender for pouring acrylic colors. "Crazing" is the formation crevices in surfaces that develop as acrylic paints and mediums dry. The addition of GAC 800 promotes drying with a smooth, even film, good gloss and flexibility, but with moderate clarity. GAC 800 is also useful for adhesion to chalky surfaces. GAC Acrylic Polymers only have a minimum amount of thickeners, levelers, defoamers and surfactants to ensure good film formation. 128 ounce bottle