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Finally got time to insulate and weld the 1/8 steel jacket on the firebox. Used 2' X 4' pieces of 2" thick mineral wool insulation. 3 pieces worked out just right.
You can etch off the galvanize with muriatic acid. I have done this to avoid welding the galvanizing. I can't be positive that it will get it out of the pores of the metal surface, though. Don't breathe the fumes. Do it outdoors.
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