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#6 Mastic® seals all air duct types including UL listed air ducts, thermal insulation and crawl space vapor retarders.
RCD Corporation #6 Mastic Low to High Velocity Air Duct Sealant is preferred by professional HVAC and home weatherization contractors nation wide for permanently sealing the joints and seams of thermal insulation, crawl space vapor retarder, house wrap and all air duct types including UL listed air ducts. #6 Mastic seals leaks in return air ducts, supply ducts, air handlers, plenums, grilles, registers, dampers, and boots 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. Easy application by brush, trowel, palm, spray, or extrusion.
