Yes, I did. The problem, as I mentioned in the original
posting, is what to do after welding the various sections
together. I'm not aware of any way to "touch up" hot dip
galvanizing in the field. Is there one?


Yes , there is. Clean the slag off the weld immediately after welding.
While the weld is still hot, rub it with a "zinc stick". I believe that it
is just that, a stick of pure zinc. It will melt and run over the weld area.
Zinc sticks are avilable here in Australia from BOC Pty Ltd. (Used to be
commonwealth Industrail Gasses) but I would think most good welding supply
organizations would have them available, even if they had to order them in
for you.





Do the various
zinc-containing paint products work well?

There is one here in Oz, called Cold Gal that works reasonably well but it
will be long gone before the hot dip galvanized area starts to corrode


Of course, I am ignoring the aesthetic aspects of galvanizing.
My wife might have something to say about that. :-)

Alan