Glas is a lightfast, highly pigmented, transparent, water based paint designed for glass. Glas is low viscosity and flows easily for even application. Glas can also be used on other nonporous and semi-porous surfaces such as Plexiglas, metal, ceramic, vinyl, and polypropylene. Glas is dishwasher safe without being fired by leaving to cure for 3 days or bake in the oven at 320F for 30mins to make it dishwasher safe right away.