No mixing and no mess alternative to traditional thin-set mortars spreads quickly and easily. Bonds to ceramic tile and quarry tile up to 18" x 18" (45 x 45 cm). For interior wall and floor installations. Suitable for wet areas such as tub surrounds and shower walls. Do not use on shower floors or areas with exposure to prolonged water or steam. Do not use to install fixtures, stone tile, porcelain, Saltillo pavers, or glass tile. Bonds to concrete, masonry, plaster, drywall (dry areas), WonderBoard, cement backerboards, exterior grade plywood (dry areas), existing ceramic tile, and vinyl flooring. Protected with MoldGuard Technology to resist mold and mildew growth. Under normal conditions allow a minimum of 24 to 36 hours drying time before grouting. Remove fresh mortar from tile surfaces with a damp cloth. Clean tools in warm, soapy water. Coverage: 50 to 60 sq. ft. per gallon using a 3/16" x 5/32" V-notch trowel for tile up to 6" x 6". 40 to 50 sq. ft. per gallon using 1/4" x 1/4" x 1/4" square notch trowel for tile up to 12" x 12". 25 to 35 sq. ft. per gallon using a 1/4" x 1/4" x 3/8" square notch trowel for tile over 12" x 12". Exceeds ANSI A136.1 Type I. Color: Gray.