BOSTIK"S BEST is a one-part, trowel applied, tacking, moisture-cured urethane adhesive. This advanced formula of Bostik"s Best Adhesive does NOT contain any water. Once cured, Bostik"s Best is waterproof and is not affected by moisture or water; its superior properties provide a tough, flexible and tenacious bond to a variety of surfaces. Bostik"s Best Wood Floor Adhesive holds elastomeric characteristics, which allows the adhesive to expand and contract according to the movement of the Hardwood floor. Bostik"s Best is currently the number one selling urethane in the Hardwood Industry!