$1282
- Creates air-tight seals on duct seams and joints
- Meets or exceeds most energy codes
- Fiber reinforced, water based, low odor
How to Get It
Product Overview
Master Flow Water Based Air Duct Sealant helps seal all types of air ducts to reduce the risk of conditioned air leakage. Sealing air duct plenums, takeoffs, elbows, and vent boots where they connect and sealing the seams, per product instructions, may help save energy. The sealant is fiber reinforced and easy to apply by brush, gloved hand, or putty knife to flex duct, duct board, and sheet metal air ducts. It dries to a tough, flexible, and weather resistant seal. It adheres to many surfaces like: drywall, foam and fiberglass insulation, galvanized steel, aluminum, masonry, and wood. This product is also available in 10.5 oz caulk tubes.
- Fiber-Reinforced
- Weather Resistant
- Non-Flammable
- Low Odor
- Earns LEED Credits
- UL Listed
Compare Similar HVAC Cleaners & Sealers
 |  |  | |
| Brand | Master Flow | Master Flow | Master Flow |
| Name | 10.5 oz. Water Based Duct Sealant Tube | Water Based Mastic Half Gallon Tub | 3 in. x 150 ft. Fiberglass Weave |
| Price | $788 | $1282 | $1978 |
| Ratings | (88) | (71) | (23) |
| View Product | View Product | View Product |
Questions & Answers
Typical questions asked about products:
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Customer Reviews
Jan 14, 2014
Best at what it does!
For nearly a hundred year old home with some pretty old duct work, we were heating and cooling our basement as opposed to the rest of the home. Duct tapes didn't hold up well and new air leaks would form sooner than expected. The mastic did a great job at durably holding up and sealing. Since it was an unfinished basement space, we weren't so concerned with the, shall we say, less than aesthetically pleasing final look.
by
May 20, 2021
Doesn't Compare To Good Mastic
Very watery, bought it because the HVAC store was closed. Doesn't even compare to grade quality mastic. If you want to do the jod once, the right way, don't buy this product.
by
Nov 13, 2020
Rating provided by a verified purchaser...
Rating provided by a verified purchaser
by
Oct 23, 2020
Went on easily ,dried hard....
Went on easily ,dried hard.
by
Oct 7, 2020
My air duct was leaking, I patched the leak and applied the sealant. I then let the area dry for ...
My air duct was leaking, I patched the leak and applied the sealant. I then let the area dry for about 1 hour before turning on my AC. It has been about 3 weeks and the patch is holding.
by
Sep 1, 2020
Works great at sealing small cracks/joints in ducts, easy to apply with a regular paint brush. Me...
Works great at sealing small cracks/joints in ducts, easy to apply with a regular paint brush. Meets expectations.
by
Aug 19, 2020
Rating provided by a verified purchaser...
Rating provided by a verified purchaser
by
Mar 27, 2020
Good stuff...
Good stuff
by
Mar 11, 2020
Rating provided by a verified purchaser...
Rating provided by a verified purchaser
by
Feb 25, 2020
Nice.
Nice.
by
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