Ultraseal Green

Miracle® Ultraseal Green is a water based, fibrous interior/exterior grade sealant/mastic specifically formulated for use in the fabrication, sealing and coating of UL 181B Flexible Air Ducts. Ultraseal Green can be also be used with metal and fiberglass. Ultraseal Green exhibits high resistance to mold, mildew, water, extreme temperature changes and aging. Ultraseal Green is also resistant to oil and grease.


  • Resistant to extreme temperature changes and aging
  • Highly resistant to mold and mildew
  • Resistant to oil or grease
  • Mildly resistant to alkalis and acids
  • Easy to apply and clean up
  • No sag


  • SCAQMD, Rule 1168
  • California Air District Regulations
  • Ozone Transport Commission (OTC) Rule for Adhesives and Sealants


  • Contributes to LEED and other green building credits
  • UL Classified: Adhesives R-6891
  • UL Listed 181B-M
  • NAHB National Green Building Program


  • 1 Gal. Pail


  • Light gray