Thinset, Product Form Powder, Application Bonds tile, stone, and marble to surfaces like concrete, cement board, and plywood, may be used in exterior applications such as non-sale water pools, and other submerged areas, For Use On Surface Material Concrete, existing tiles, approved waterproofing and uncoupling membranes, plywood, metal, Mortar Type K, Container Size 40 lb, Container Type Bag, Working Time 24 hr, Full Cure Time 24 hr