Noise S.T.O.P. Pro Series Super AD is a Polyurethane panel adhesive that generates three times the power of ordinary adhesives. It can be used indoors or outdoors and will last as long as the products it is bonding. Bonds to nearly all surfaces. Great for applying acoustical panels in overhead applications. USE IN WELL VENTILATED AREA CLASS IIIB Flammability. Do not expose to direct flame.