For floor underlayment, Dash Patch is used to fill cracks, score lines and ruts in dry concrete sub-flooring and for patching holes or cracks in wood sub-floors. Bonds to concrete, wood, or plaster. When Dash Patch is mixed with water, it forms a plastic composition that can be troweled onto most surfaces to provide a smooth base prior to the installation of vinyl tile, rubber, cork, wood and carpeting flooring products. Rapid setting time, high early strength, and durable. Trowels easily onto a smooth surface. Can be feather-edged or used in thicknesses up to 1/2''. 100 lbs. (4 bags) of Super Dash Patch will cover approximately 180 square feet at 1/16'' thickness. Color: Gray. 25 lb. bag.  Curing time minimum 90 minutes.