RCD Corporation® #8 Mastic® is a low VOC adhesive-sealant used for permanently sealing the fabricated joints and seams of sheet metal air ducts, UL-181 listed rigid fiberglass air ducts, UL-181 listed flexible air ducts and thermal insulation. RCD Corporation® #8 Mastic® is the best choice for high velocity sheet metal air duct construction. It is also ideal for repairing damaged and leaking air ducts and sealing conditioned spaces from air infiltration. Easy application by brush, trowel, palm, spray or extrusion. 

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Water-Based & Non-Flammable High Solids Content Contains Ceramic Microspheres Low Odor Low VOC - less than 10 grams/liter Weather Resistant Fire Resistant	Elastomeric Easy Application & Clean-Up Earns LEED Credits
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