[Rick D]

Originally Posted by Vince@MSperfab

That is light but its deep. Sanding it may push it deeper.

I would use a rust dissolver/remover such as http://www.harborfreight.com/http-ww...6431-html.html

then wipe down with some metal prep.

Not sure on this one Vince?? I'm not a big fan metal prep either

I would take a small hand sandblaster and just blast it clean. That's what I do for areas like that.

Those converters can leave behind residue that can work its way back up after paint. Ask me how I know

Oh I've never done it but have seen it a few times at resto shops with issues.