Golden - Acrylic Medium - GAC-200 Polymer - 16 oz - GOLDEN GAC-200 Specialty Acrylic Polymer is a liquid acrylic polymer emulsion that is the hardest and least flexible of GOLDEN acrylics. Useful for increasing film hardness and reducing tack. Increases adhesion to non-porous surfaces; however some surfaces, such as glass and glazed tile, will not allow for a permanent bond. Used in its pure form, it is limited to applications on non-flexible supports. Generally recommend a maximum level of GAC 200 be 33% of the entire paint mixture.