Long - lasting "invisible" nano-scale barrier coating SEALS, POLISHES & PROTECTS glass, porcelain & ceramics...windows, patio doors, glass shower doors & enclosures, porcelain sinks & bathtubs, and ceramic tile walls & counters. Repels water, soil & stains for easier cleaning. Keeps surfaces like new - prevents the adhesion and buildup of hard water minerals, soap scum, rust & lime scale.