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#7 Mastic® Low to High Velocity Air Duct Sealant is a premium grade, water-borne, gray, flexible sealant used to permanently seal the fabricated joints and seams of sheet metal air ducts, rigid fiberglass air ducts, flexible air ducts, crawl space vapor retarders, and thermal insulation. Easy application by brush, palm, putty knife, trowel, or spray equipment.

#6 Mastic® Low to High Velocity Air Duct Sealant is a fiber reinforced, white, water-borne, UL listed sealant used to seal the joints and seams of thermal insulation, crawl space vapor retarder, house wrap & all air duct types. UL listed for use on flexible and rigid fiberglass air ducts. Easy application by brush, caulk gun, palm, putty knife, trowel, or spray equipment.