Polyken 360-17 WATERPROOFING REPAIR TAPE FOILMASTIC SEALANT TAPE - Printed, 2 mil dead-soft aluminum foil backing with 15 mil butyl rubber mastic adhesive (PRINTED). Applications Indoor or outdoor sealing of low, medium & high pressure HVAC duct systems (includes: metal duct, fiberglass duct & flexible duct systems). Seal cracks and seams in gutters, roof alleys, eaves, hips and ridges. Seal around chimneys and vent stacks. Repair gouges, rips, tears in metal panels of trailers, shipping containers and metal buildings. Mobile home repair. Application temperature from 20ºF to 200ºF. --SMACNA A, B, and C Seal Classes Features & Benefits Permanent sealant. Acceptable for use on galvanized materials. Heavy duty all weather foil coated butyl mastic. Excellent adhesion to all surfaces. 2 mil dead soft aluminum backing. Extremely conformable. Provides instant water tight bond. 0n-staining adhesives. Paintable - use in place of caulking. Excellent resistance to cold, heat, water, and sunlight. Printed for easy identification.