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Oh, and you might find it easier to practice a bit on 1/4" to 1/2" scrap steel before trying to weld sheet metal. Once you have the principle down it'll largely be a matter of having the Amp and wire feed settings right for thin stuff.
Good decision, I think. And there are lots of MIGs to choose from.
You may want to get something better than inexpensive, though. It'll be easier to use and last longer.
Buying a MIG and learning to use it (if I could, anybody can) would pay for itself on that repair alone, I would think.
And then there's the chance that there's more rust damage to be found, so getting a MIG would really pay off.