StopGap™ Sealant is a highly elastic, water-based sealant used for reducing sound transmission at the perimeter of wall systems, or around electrical box cutouts to achieve specified STC/MTC values. The surface dries to a tough film, but the sealant remains flexible and stays pliable for up to 5 times longer than alternative brands. Unlike other products, StopGap™ has no residual run-off. StopGap™ is paintable (dries white) and non-staining, and meets ASTM E-84 standards for flame retardancy.
StopGap™ comes in a large, 28 oz. caulking tube and therefore requires a larger than normal-sized caulking gun, which can be purchased at any local hardware store.