Pro formula all-purpose thin-set mortar offers high flexibility and bond strength for floor and wall tile installations. Use to adhere vitreous, semi-vitreous, or absorptive tile; ceramic, mosaic, quarry, cement, impervious porcelain and glass tile, brick and mini-brick, precast terrazzo, and natural stone tile. Polymer modified Portland cement mortar systems provide excellent adhesion to structurally sound plywood substrates, cementitious surfaces, wonderboard, rhinoboard, cement backer boards, existing ceramic tile, resilient flooring or plastic laminates, VCT tile, cutback adhesive, interior or exterior floors, countertops, and walls. Exceeds ANSI A118.4 and A118.11 without the need for additives. Approximately 90 sq. ft. to 100 sq. ft. coverage per 50 lb. applied with 1/4" x 1/4" x 1/4" square notched trowel. Allow to cure for 24 hours before grouting or light traffic. 50 lb. bag.