Formulated from a high quality vinyl emulsion that, when cured, is tough yet flexible and can be painted. Readily adheres to most building materials. Bonds glass, metal, wood, ceramic and canvas. Caulks around tubs, showers, tiles, windows, sinks and seals cracks and seams, inside or outside. Can even be used on surfaces that are not completely dry. Water and mildew resistant; little affected by exposure to mild acids, alkalis, salt water, oil and gasoline. Non-toxic, non-flammable. Water clean up.