Formulated with 100% acrylic polymer dispersion, and engineered to have the same optimized working time as Golden OPEN Acrylics, the OPEN Acrylic Gloss Medium will stay wet on the palette for extended periods without skinning over. It can be used to extend paint, regulate transparency, create glazes, increase gloss, reduce viscosity, or improve adhesion and film integrity. A medium with endless creative possibilities! Contains 4 oz.