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: 378092805

Details

Brand
Corning
Style
Compact
Item Weight
300 Grams
Item dimensions L x W x H
29.5 x 4.8 x
Item Form
Paste

🧪One-component formula

⚙️Non-sag consistency

🌬️Cures at room temp

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B/.228

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In stock

Sold byAmazon PanamaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔧 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.

Specifications

ASIN	B008R14R08
Brand	Corning
Brand Name	Corning
Compatible Material	Rubber
Country of Publication	USA
Customer Reviews	4.7 out of 5 stars 44 Reviews
Item Dimensions	29.5 x 4.8 x 4.8 Centimeters
Item Form	Paste
Item Weight	300 Grams
Item dimensions L x W x H	29.5 x 4.8 x 4.8 Centimeters
Manufacturer	Dow Corning
Manufacturer Part Number	1892118
Model	1892118
Style	Compact
Style Name	Compact
UPC	077472131419
Unit Count	298.69 Milliliters

Reviews

A**R

Good product and delivery.

Works as promised.

9.02.2026

W**R

Works Exceptionally Well

Great for reattaching foam padding on paddle boards.

4.10.2025

M**E

Llego con otro nombre

5.03.2023

T**S

Worth the money for every project!

One of the best bathroom caulks on the planet. Very smooth application, easy to control dispensing volume when moving between large and small gaps. The caulk wipes smooth with little effort. This is a caulk that cures quickly (skins in about 5 minutes) so work and smooth as you go. It has an odor during the curing process so ventilate if your working in a confined space like a shower stall. The caulk lasts for years in the bath area with no discoloration. The caulk will also stay usable for up to 6 months after opening as long as the cap is installed.

5.07.2021

W**G

The best silicone made in the world.

Dow 732 is the benchmark of silicone. It meets all the mil spec for silicone. It’s not something that doesn’t meet specs and is packaged for way less money. As a polymer engineer this is the only silicone I will ever use.

19.09.2025

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Trustpilot

TrustScore 4.5 | 7,300+ reviews

Anita G.

Good experience, but the tracking updates could be better.

2 months ago

Vikram D.

The MOLLE sheath is of exceptional quality. Very happy with my purchase.

2 weeks ago

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