can this be used to seal copper duct?

I would use it myself but a lot depends, size of gap to be filled,( may have to layer it on. ), is it going to be subject to extreme temps, which should not be an issue. We use it at work to adhere rubber seals onto airplane wings. This stuff is tough. I bought some for home use in all 3 colors, have used the white, we use clear at work. Haven't tried the black. But if anything will seal it, this stuff is premium quality. Depending on area temp, this needs to be in place rather quickly, don't start and then go to bathroom. Average temp will give a 3 to 5 minute window before starting to set. Practice on a small piece first to get idea of set time to work. Clean area to receive sealer with acetone or vinegar. Not sure which would be best, experiment. Will it stick to copper? I just don't know, but can say this is the best sealer I've ever used and the airline industry uses it, just not on copper.

yes, there is an odor of acetic acid, (vinegar like smell)

I'm looking for a mold resistant shower caulk. is the the best there is out there?

We recommend Dow Corning 786. The color white is sold singly, in packs of 3 and 6 and in a case of 12 cartridges. Please search for the following ASIN numbers within Amazon..B00VP70XJA, B01ATLTZ6O, B012B34SDS, B012B0Q5PK Thank you, PK Supplies, Inc.

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🔧 Seal the Deal with Dow Corning!

FLEXIBLE TOUGH - Cures into a durable, flexible rubber that withstands the test of time.
MOISTURE ACTIVATED - Cures quickly when exposed to air moisture, ensuring efficiency.
COMPACT CONVENIENT - Lightweight design makes it easy to store and transport.
SEAL WITH CONFIDENCE - This silicone sealant offers a reliable bond for all your projects.
EFFORTLESS APPLICATION - Designed for easy use, making DIY a breeze.

Dow Corning 732 Multi-Purpose Silicone Sealant is a versatile, one-component adhesive that cures to a tough, flexible rubber. With a non-sag paste consistency and moisture-activated curing, this sealant is perfect for a variety of applications, ensuring a reliable bond every time. Ideal for both professionals and DIY enthusiasts, it comes in a convenient 10.1-ounce package.

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Brand	Corning
Style	Compact
Item Weight	300 Grams
Item dimensions L x W x H	29.5 x 4.8 x 4.8 Centimeters
Item Form	Paste
UPC	077472131419
Net Quantity	298.69 millilitre
Manufacturer	Dow Corning
Country of Origin	USA
Model number	1892118
Item Weight	300 g
Product Dimensions	29.5 x 4.8 x 4.8 cm; 300 g
Item model number	1892118
Item Height	4.8 Centimeters
Item Width	4.8 Centimeters
Are batteries included?	No

Dow Corning 732 Multi-Purpose Silicone Sealant - White, 10.1 Ounce

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