[Too Many Projects]

I don't suggest rust converter under touch up paint, unless it is formulated for a self etching primer, which has acid in it as well. If you get paint from a color match touch-up source, get the correct primer/sealer with it and ask what they want under the primer, if anything. I try to prep the surface with a small piece of 180, but when the chip is small, that's not practical, as it will mark the paint around it too.