Acrylic mortar and grout additive. Increases tensile and bond strength, water-resistance and flexibility of thin set mortar and Portland cement grouts. Recommended for installing wall tile, ceramic, mosaic, paver, and quarry tile. Coverage: As an additive to custom thin set mortar, ratio is 1 quart liquid to 5 lb. thin set mortar powder. Can also be used with custom floor leveler for added strength. 2-1/2 gallon bottle.