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

Product ID: 16886847

Details

Brand
Corning
Item Weight
300 Grams
Item dimensions L x W x H
11.61 x 1.89 x
Material
Rubber
Style
Compact

⏳Cures 3mm in 24h

🌡️Stable -60°C to +180°C

🛠️Multi-surface adhesion

$37.36

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Description

🔧 Seal the deal with confidence—flexible, tough, and ready for anything!

ALL WEATHER RESILIENCE - Withstands extreme temps from -60°C to +180°C, ensuring durability in any environment.
EFFORTLESS APPLICATION - One-component, non-sag paste that applies smoothly and cures at room temperature—no fuss, no mess.
FLEXIBLE TOUGH FINISH - Transforms into a flexible rubber that resists cracking and maintains integrity under stress.
VERSATILE BONDING POWER - Adheres seamlessly to glass, metal, ceramic, wood, plastics, and more for all your project needs.
LONG SHELF LIFE RELIABILITY - 900-day shelf life at 32°C means you’re always ready for your next big fix.

Dow Corning 732 Multi-Purpose Silicone Sealant is a premium white silicone adhesive that cures at room temperature via an acetoxy system, forming a durable, flexible rubber. It offers exceptional adhesion across multiple surfaces including glass, metal, ceramics, and plastics, withstanding temperatures from -60°C to +180°C. Waterproof and stable, it cures 3mm deep in 24 hours and boasts a 900-day shelf life, making it the go-to sealant for professionals demanding reliability and versatility.

Specifications

ASIN	B008R14R08
Best Sellers Rank	#83,072 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #161 in Silicone Adhesives
Brand Name	Corning
Color	White
Compatible Material	Ceramic, Glass, Metal, Non-oily Woods, Painted Surfaces, Plastic, Porcelain, Rubber
Customer Reviews	4.8 4.8 out of 5 stars (58)
Item Dimensions	11.61 x 1.89 x 1.89 inches
Item Form	Paste
Item Weight	300 Grams
Manufacturer	Dow Corning
Material Type	Rubber, Silicone
Model	1892118
Number of Items	1
Part Number	1892118
Style Name	Compact
Surface Recommendation	Wood
UPC	077472131419
Unit Count	1 Count
Water Resistance Level	Waterproof

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