On Sep 6, 9:39*pm, wrote:
Hello,

I'm working with some galvanized metal ( the stuff that you use to
take the smoke from a wood-burning fireplace out through the roof of a
house) that I'm bending into a box... about 16" x 4". *It has the
right shape, but I want to make sure that it is waterproof as it is
going outside, and want to ensure that it will stand the test of time
in regards to moisture, heat, cold, etc. *What is the best way to
ensure this? *I've thought that maybe I should purchase a soldering
gun and put some solder on the joins...will this stand the test of
time? *How about epoxy or liquid nails? *How about using both solder
and some sort of adhesive?

Thanks

If the galvanizing coating is not cracked or compromised, it
should be fine. If it is I don't think solder would work well. Some
sort of protective coating suitable to direct exposure to the elements
and any heat levels it might be exposed to would be the only choice.