CRL Vitroglaze Protective Glass Coat is a permanent coating that prevents the adhesion and build up of contaminants onto the surface. For the treatment of glass, tile, porcelain, marble, terrazzo and granite. Repels water, dirt, and oil. Protects from chemical erosion, soap scum and limescale buildup. Nano technology non-stick invisible coating. Will last up to 10 years. Keeps glass surfaces looking like new. Cuts cleaning time by up to 90%.