0050206992005

Model WBA50

Internet #100396973

Store SKU #559722

Store SO SKU #1000683931

Water Based Mastic Half Gallon Tub

$11.95 /each
  • Create air-tight seal on duct seams and joints
  • Meets or exceeds most energy codes
  • Convenient 1/2 gallon tub for small jobs

Frequently Bought Together

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

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Customer Questions & Answers

5 Questions13 Answers

Customer Questions & Answers

Water Based Mastic Half Gallon Tub
Water Based Mastic Half Gallon Tub

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6 answers

after it dries how can I remove any of it to improve the looks of a sloppy installation?

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July 2, 2015
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Asked by
Bristol, Virginia
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Home Improvement Profile: Professional
August 5, 2016
Answer: 
I worked in the sheet metal union in Cleveland Ohio and installed a lot of duct work and used a product simmilar to this very often. If we used this in a visible area and one of the apprentices done a sloppy job we put 2" Aluminum Foil Tape over the section to make it look presentable.
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Asked by
Dothan, Alabama
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Home Improvement Profile: Professional
July 23, 2016
Answer: 
I'm not sure what you used, Mastic seals are normal off white. If this is a tar based seal, use a window scraper that uses razor blades and mineral spirts.
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Asked by
So Cal
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Home Improvement Profile: DIYer
November 12, 2015
Answer: 
If the duct work is inside the conditioned area don't seal it or insulate it. This stuff is great for hidden areas. Attic, walls, and basements. You should have used the connecting products recommended by the duct manufacturer. Clean this off and do it right man.
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Asked by
Tampa, Florida
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Home Improvement Profile: Professional
October 6, 2015
Answer: 
The preparation comes before, what I normally do is use masking tape to outline the area I will be covering. Once it's dry I pull the tape off to give it a clean look. Based on your pictures I can only suggest a razor blade or you can tape and apply a light coat.
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August 4, 2015
Answer: 
Silver or aluminum finish spray paint my friend.
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July 6, 2015
Answer: 
Since this product has high adhesion properties, any excess will have to be cut or sanded away.
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2 answers

Do you sell this product in red deer ab

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July 31, 2016
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August 22, 2016
Answer: 
Is this product in the reddeer store
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Asked by
Dothan, Alabama
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August 2, 2016
Answer: 
Check with your local Home depot at the Pro-Desk and they will be glad to help you with this.
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2 answers

Would this seal small holes on flexible duct

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Kissimmee, FL.
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July 15, 2016
Animals got under my house. Would this seal small pinholes in the duct?
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Asked by
Bristol, Virginia
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Home Improvement Profile: Professional
August 5, 2016
Answer: 
Your best bet is to use 2" Aluminum Foil Tape for flex.
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Asked by
Dothan, Alabama
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August 2, 2016
Answer: 
Yes, If they are not all the way through.
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2 answers

is this used for sealing over asbestos tape

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seattle
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September 22, 2015
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Asked by
Dothan, Alabama
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July 23, 2016
Answer: 
Yes, You can use this.
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September 24, 2015
Answer: 
Thank you for contacting MasterFlow ... No, we have not tested nor can we recommended your intended use of this product. Please call Technical Services at 800-211-9612, M-F 8A-5P EDT, with any additional questions.
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