HENRY 565 is a self-leveling underlayment used to smooth and flatten interior surfaces, such as concrete, wood, ceramic tile and properly prepared adhesive residues on concrete, prior to the installation of floor coverings. Due to its unique leveling and drying characteristics, HENRY 565 allows floor covering installation to proceed in as little as 6 hours for ceramic tile and 16 hours for other floor coverings. Sold in a 40 lbs bag.