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Water Based Mastic Half Gallon Tub

$1282
  • Creates air-tight seals on duct seams and joints
  • Meets or exceeds most energy codes
  • Fiber reinforced, water based, low odor
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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

Additional Resources

From the Manufacturer

Compare Similar HVAC Cleaners & Sealers

10.5 oz. Water Based Duct Sealant Tube
current product
Water Based Mastic Half Gallon Tub
3 in. x 150 ft. Fiberglass Weave
BrandMaster FlowMaster FlowMaster Flow
Name10.5 oz. Water Based Duct Sealant TubeWater Based Mastic Half Gallon Tub3 in. x 150 ft. Fiberglass Weave
Price
$788
$1282
$1978
Ratings
(88)
(71)
(23)
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Customer Reviews

  • 3.9
    out of 71 reviews
  • 67%recommend this product
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Showing 1-10 of 71 reviews
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
    • Recommended
    12 found this review helpful
    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
      Rating provided by a verified purchaser...
      Rating provided by a verified purchaser
      by
      • Verified Purchase
      Went on easily ,dried hard....
      Went on easily ,dried hard.
      by
      • Verified Purchase
      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
      • Verified Purchase
      • Recommended
      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
      • Verified Purchase
      • Recommended
      Rating provided by a verified purchaser...
      Rating provided by a verified purchaser
      by
      • Verified Purchase
      Good stuff...
      Good stuff
      by
      • Verified Purchase
      Rating provided by a verified purchaser...
      Rating provided by a verified purchaser
      by
      • Verified Purchase
      Nice.
      Nice.
      by
      • Verified Purchase
      • Recommended
      Showing 1-10 of 71 reviews