I have no clue.. I haven't even thought that far ahead. I am painting all my welds and raw steal with etching primer just to make sure nothing turns or starts surface rust. In the picture the primers has a light green tint.
Yep that's what I use, good thinking. You can get etch primer in a small bottle with a dabber on the end for small areas great for quick touch ups.
When your car is done I would love to see it.