Golden GAC 200 Acrylic Polymer Medium
This medium promotes adhesion and film hardness. It is the hardest and least flexible polymer offered. Ideal for mixing with acrylic colors to increase film hardness, reduce dry film tack and to increase adhesion to many non-porous surfaces. It will help paint stick to glass and resist scratching. Dries to a clear, high gloss, finish. GAC 200 is not recommended for flexible supports.
Check out Golden’s blog about how to paint on glass with GAC 200