CRL TPC Surface Protector will actually seal the pores of glass, porcelain, ceramic, plastics, polished metals, fiberglass and marble to make the surface water, soil and stain resistant. The clear coating guards against the adhesion and build-up of dirt, grime, mold, mildew, rust and mineral deposits. Environmentally friendly and non-toxic, CRL TPC Surface Protector permits the practice of preventive maintenance, reducing costly cleaning, repairs and replacement. Simply spray on and polish off. One fluid ounce (29 milliliter) of TPC Surface Protector protects approximately 15 square feet (4,572 square millimeters) of glass.