Premixed and ready-to-use Type I Mastic for installing ceramic, porcelain, natural stone, quarry and mosaic tile on floors and walls. Can be used for countertop, backsplash and shower wall installations. Bonds with concrete, masonry, cement backer board, gypsum wallboard, coated glass mat backer board, water resistant gypsum wallboard, existing ceramic or resilient tile, plastic laminate and association grade exterior plywood. Spreads effortlessly, sets quickly and is easy to clean.