Bostik's Best is a one-part, trowel-applied, moisture-cure, urethane adhesive. Once cured, its superior elastomeric properties provide a tough, flexible, tenacious bond to a variety of surfaces. The elastomeric characteristics of Bostik's Best allow the adhesive to move with wood as it expands and contracts. This scientifically-formulated adhesive is not affected by exposure to moisture or water. Bostik's Best contains no chlorinated solvents or ozone depleting chemicals.