Henry 547-410 Port Cement Underlay, 10 LbUse for preparing substrates to accept flooring. For use as a patch, underlayment, or embossing leveler. Use with almost any substrate. Fast setting. Ready for most floors in 1 2 hours. Non sanded formula trowels easily for a smooth finish. Non shrinking. Reduces installation time. Exceeds 5000 PSI compressive strength. Bonds to concrete, ceramic tile, quarry tile, and terrazzo (except metal terrazzo strips), wood and wood underlayments, clean and