Floor Patch Pro requires no priming for use over concrete, wood, and cement terrazzo substrates, as well as cutback residue adhesive. The polymer-modified, cement-based patching compound is a single-component product that can be applied as thin as a featheredge or up to 2 inches deep. It contains no large aggregate in order to create ultra-smooth finishes for final floor covering. Use with tile and stone installations an hour after application or within two to three hours for moisture-sensitive floor coverings. The product also achieves a compressive strength of more than 3500 psi. Bonsal American. 800-738-1621. www.prospec.com