GoBoard Sealant is a hybrid sealant and adhesive that is moisture curing, permanently elastic and provides superior adhesion to GoBoard and other common building materials. Use GoBoard Sealant to waterproof GoBoard joints and fastener penetrations and adhere GoBoard to itself and other building materials that makes it perfect for installing shower niches, and benches. Easy to dispense with standard caulk gun. Good for interior or exterior applications. Specifically designed for easy use and quick drying. Estimate one tube 10.3 oz of sealant for every 1-1/2 GoBoard 3x5 installed. Meets and exceeds ASTM C920, Type S, Grade NS. Environmentally friendly, non-toxic and exhibits minimal odor as it contains no solvents or isocyanates.