An extremely versatile product which can be used both inside and outside for long-term applications. Use 425 for a myriad of general repair applications. 3M aluminum foil tape features an acrylic adhesive combined with a durable aluminum backing, and is long-aging so you don't have to worry about replacing it for many years to come. The aluminum backing is both heat reflective and flame resistant which aid in protecting parts of your facility from heat & potential fires.