A Portland cement-based, self-leveling underlayment used to smooth and flatten interior surfaces prior to the installation of floor covering. HENRY 565 can be walked on in as little as 2 hours and ceramic tile can be installed in only 6 hours. Can be installed from a 1/8" thickness up to 5 inches. Designed to be used with today's glue-down and glueless flooring. Must use Henry 564 FloorPro Underlayment Primer prior to use. Coverage: 43 sq. ft. with 40 lb. bag at 1/8" thickness. Working time: 10 minutes 70 deg. F. 40 pound bag of powder.