91386 2"X 50 YD ALUM. FOIL TAPE | Aluminum foil backing coated with a strong, durable adhesive. For sealing heating and cooling air ducts, especially the new duct board systems. Flame retardant tape helps prevent loss as well as blocks odors and moisture. For metal repair jobs or decorating jobs around the home. Silicone-coated release liner for wrinkle-free unwind and easy application.