Gallon, Ready To Use Flexible Floor Levelor, Latex Based Product Used To Fill Cracks, Fastener Or Knot Holes & Level Low Areas In Plywood Subfloors Or Concrete Surfaces, The Floor Patch & Leveler Will Remain Flexible Allowing The Plywood Subfloor To Flex Without Cracking The Filled-in Areas, Ideal For Filling & Leveling Surfaces Prior To Installation Of Carpeting, Vinyl Floor Tile Or Sheeting, As Well As Ceramic Or Mosaic Floor Tile.