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  • Weather Resistant
  • High Solids Content
  • Professional Grade
  • Fast Drying
  • Elastomeric 
  • Earns LEED Credits
  • Water Borne
  • Easy to Apply

#7 Mastic - 1 Gallon Pail


RCD Corporation #7 Mastic® is a premium grade, water-borne, non-flammable, low to high velocity sheet metal air duct sealant used to fabricate and repair air ducts and thermal insulation. Color is gray and is easily applied by brush, extrusion or spray equipment. See RCD Technical Bulletin for spray 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 and we will be happy to fulfill your order.