Stontex Porcelain ProtectorStontex Porcelain Protector can be used for internal and external application,suitable for all types of finishes on porcelain tiles. Directions: *Before application the surface must be completely clean and dry. *Generously apply with a low pressure sprayer, roller or brush. *Apply a second application approximately 45 60min. after the first application repeating the process. *It will take at least 24 hours before the product will offer full protection.