7 LB, #549, Sub Floor Patch & Skim Coat Feather Finish, Prep & Prepare, Easily Fills In Ridges, Gouges, Depressions & Seams All Most Any Sub Floor, Use Over Any Surface & Dries In 15 Minutes, Installs From Feather Edge To A Depth, Easy To Mix By Adding Water, No Primer Or Additives Needed, Portland Cement Based, Will Not Stain Or Mildew, Exceptional Bond To Concrete, Wood, Terrazzo & Ceramic Tile, Coverage At 7 LB Unit Covers Up To 24 SQFT At 1/8", When Skimming Over Concrete, Coverage Is 70-100 SQFT & Over Plywood, Up To 198 SQFT Can Be Achieved.