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.

Dow Corning 732 Multi Purpose Silicone Sealant White 10 1

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Sold byAmazon RomaniaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔧 Seal Smart, Last Long – The Ultimate Multi-Surface Solution!

NON SAG PASTE CONSISTENCY - Enjoy precision and control with a non-drip formula that cures into a tough, flexible rubber for lasting performance.
EXTREME TEMPERATURE RESILIENCE - Stay worry-free with a sealant that remains flexible and durable from freezing cold to scorching heat (-60°C to +180°C).
EFFORTLESS ONE STEP APPLICATION - Simplify your projects with a single-component sealant that applies smoothly and cures on contact with air moisture.
LONG SHELF LIFE RELIABLE CURE - Stock up without stress—900 days shelf life and a reliable 24-hour cure time at room humidity keep you ready for any project.
UNIVERSAL SURFACE COMPATIBILITY - Seal and bond confidently on glass, metal, ceramic, painted surfaces, plastics, and non-oily woods—versatility that fits every job.

Dow Corning 732 Multi-Purpose Silicone Sealant is a white, one-component adhesive that cures at room temperature via an acetoxy moisture cure system. It offers a non-sag paste consistency that transforms into a tough, flexible rubber, adhering to a wide range of materials including glass, metal, ceramics, and plastics. With excellent dielectric properties and temperature stability from -60°C to +180°C, it is waterproof and compliant with MIL-A-46106 and FDA standards. Its 10.1-ounce compact tube provides a 900-day shelf life and reliable 24-hour cure depth, making it a trusted choice for professional and DIY sealing needs.

Specifications

ASIN	B008R14R08
Best Sellers Rank	#109,207 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #204 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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