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

Product ID: 260182527

Details

Brand
Corning
Item dimensions L x W x H
29.5 x 4.8 x
Item weight
300 Grams
Material
Silicone
Style
Compact

💧Water-resistant silicone formula

🧴Non-sag, easy-apply paste

🛠️10.1 oz compact tube

₩42538

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Description

🔧 Seal it like a pro—because your projects deserve the best!

UNIVERSAL GRIP - Bonds glass, metal, ceramic, plastic & more—versatility unlocked
SLEEK WHITE FINISH - Clean, professional look that blends seamlessly with any surface
FLEXIBLE DURABILITY - Cures to tough, flexible rubber that withstands wear
ONE COMPONENT WONDER - Effortless single-step application for busy pros
MOISTURE ACTIVATED CURE - Air moisture triggers fast room-temp curing—no fuss, no wait

Corning Dow 732 is a premium 10.1-ounce white silicone sealant designed for multi-purpose use. Featuring a non-sag paste consistency, it cures at room temperature upon exposure to air moisture, forming a durable, flexible rubber seal. Compatible with a wide range of materials including glass, metal, ceramic, and plastics, it offers water resistance and reliable adhesion for professional-grade sealing and bonding.

Specifications

ASIN	B008R14R08
Best Sellers Rank	#32,604 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #85 in Silicone Sealers
Brand	Corning
Brand Name	Corning
Color	White
Compatible Material	Ceramic, Glass, Metal, Plastic, Porcelain, Rubber
Customer Reviews	4.7 out of 5 stars 45 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
Item weight	300 Grams
Manufacturer	Dow Corning
Material	Silicone
Material Type	Silicone
Model	1892118
Number of Items	1
Part Number	1892118
Style	Compact
Style Name	Compact
Surface Recommendation	Window
UPC	077472131419
Unit Count	1 Count
Water Resistance Level	Water Resistant
Water resistance level	Water Resistant

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Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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₩42538

Duties & taxes included

In stock

Sold byAmazon South KoreaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to South Korea.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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