Gorilla Heavy Duty Mounting Tape is a double-sided tape that mounts in an instant, for a permanent, weatherproof bond. The industrial strength, double-sided tape delivers a heavy-duty bond that holds up to 30 pounds. Gorilla Heavy Duty Mounting Tape is perfect for indoor and outdoor projects and sticks to smooth and rough surfaces. Completing DIY projects are easy with this tough, double sided tape. Mount, build, and repair. Weight limits may vary depending on surface texture, porosity and flatness of the surface. Both surfaces must be completely flat to make full contact with adhesive.