Marabu 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 leave it for 3 days or baked in the oven at 320F for 30mins to make it dishwasher safe. Glas should be applied using soft natural fiber brushes and cleans up with soap and water. To avoid bubbles do not shake the bottle.