RCD Corporation® #6 Mastic® is the professionals choice for permanently sealing the fabricated joints and seams of sheet metal air ducts, UL-181 listed rigid fiberglass and flexible air ducts, thermal insulation, crawl space vapor retarder and house wrap. It seals all types of leaks in central air heating and cooling systems: return air ducts, air handlers, plenums, grills and registers, dampers, and boots to name a few and is used in home sealing  to reduce air infiltration into the living area. Sealing the home from air infiltration, sealing air ducts and crawl space sealing improves indoor air quality, reduces humidity, increases comfort and saves energy. Use the best - #6 Mastic® - it doesn't cost it pays! Easy application by brush, trowel, palm, spray, or extrusion.

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Water-based & Non-Flammable Weather Resistant Fiber Reinforced Contains Ceramic Microspheres City of Los Angeles Approval #RR820 Low Odor Low VOC - less than 10 grams/liter Preferred By Professionals Nationwide	Fire Resistant Earn LEED Credits Elastomeric High Solids Content Easy Application & Clean-up
Adheres to most construction surfaces, including but not limited to:
Aluminum Foil Aluminum Foil Scrim Calcium Silicate Insulation Cellular Glass Fiberglass Insulation Galvanized Steel Gypsum board Concrete	Masonry Polystyrene Foam Polyurethane Foam Polyester Plastic Primered Steel PVC Plastic Sheet Aluminum Wood