Titebond Adhesive Caulk is a urethane acrylic formula that does it all. It has excellent adhesion and flexibilty, making it the ideal choice for all interior and exterior home remodeling and repair projects. It is is mildew resistant, non-yellowing and inhibits rust. Adhesive Caulk provides a watertight seal on tubs, sinks, showers, doors, siding, vents and gutters. It also bonds and repairs ceramic tile, towel bars, molding, cove base, mirrors, tub surrounds, paneling and insulation material. It offers a quick grab, is easy to tool and finish and remains permanently flexible.