Body work where? 1/4 panels? Redo them with FG, not metal. If you do them with metal, and you don't get it perfect, the weld seams will rust even faster.
It's faster, easier, and more reliable to just cut out the sections that are rusty, and just do a wet layup of FG right there on the body, like you're fixing a boat. Do them inside and out, to make sure it's not susceptible to rusting again.
As long as you maintain the chassis properly, and keep an eye underneath, you shouldn't have any real issues with corrosion.
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