#7 Mastic® - 1 gallon pail#7 Mastic® - 1 gallon pail
#7 Mastic® - 1 gallon pail
No. 7 Mastic® - 1 quart can
#7 Mastic®

  • Fast Drying
  • Weather Resistant
  • Earns LEED Credits
  • Water Borne
  • Non-Flammable
  • Low Odor
  • Color: Grey
  • Made in U.S.A.

#7 Mastic® Premium Air Duct Sealant

RCD Corporation® #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. RCD Corporation® #7 Mastic® premium grade seals damaged and leaking air ducts and conditioned spaces from air infiltration. The U.S. Environmental Protection Agency's Energy Star® program recommends insulating and sealing air ducts. Sealing and insulating air ducts along with home and crawl space sealing improves indoor air quality and comfort, reduces excess humidity, and saves energy. Color is gray and easily applied by brush, palm, putty knife, trowel, extrusion or spray equipment.

RCD Technical Bulletin lists spray and extrusion equipment solutions.

Please note: To order quantities greater than available through RCD’s online store please contact us at 352.589.0099 or send an email to customercare@rcdcorp.com and we will be happy to fulfill your order.