Ultrabond ECO 977 is a fast-setting, 100%-solids, one-component, moisturecured urethane adhesive specifically designed for the installation of domestic solid and engineered wood flooring. Ultrabond ECO 977 can also be used in elevated subfloor moisture conditions of up to 12 lbs. (5,44 kg) MVER and 95% relative humidity when a specific installation method and trowel notch configurations are used.