Duct sealant is a soft compound often likened to dough. It is designed for both ease of handling and installation, and was originally developed for HVAC purposes. Duct sealant is used to create a seal that blocks out moisture, dust, and air movement; it can also be used to block noise as well.
After cleaning, applies a mold resistant duct coating to seal the fiberglass ductwork and prevent fiberglass and particulate from becoming airborne. If the system cannot be properly cleaned and coated, then air duct replacement may be necessary.