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Those dark areas are still rust! Bare metal means bare metal, no dark spots. It will come back to haunt if you don't take care of it. You have a number choices here, depending on skill and tool availability. The purist would cut those areas out and patch back in with new sheetmetal and TIG welding. The sloppy would just bondo it and paint over it, trusting that they would get rid of the car before the rust came back(I've got one of those!). You can grind those areas out and weld the spots back up, then grind them down flush, can get kind of tedious if you have lots of area to cover. There's some rust converter stuff you can treat the area with, I've successfully used it under fiberglas patches and paint in non-appearance areas. The pits are still there, they just aren't as apt to start rusting again very soon. My welding skills aren't up to snuff yet, so that's the way I go for now. Eventually, if there's time enough, I'll take the first option and redo the spots. Be aware that things rust through from the back as well, so what you do under the paint outside doesn't help that. Rocker panels are really bad for that. You can shoot some stuff in there to help that. On Sun, 5 Apr 1998 17:13:27 +0100, you wrote: >Hi, > >I've just got a 73 Fastback and have decided to sort out some rust that is >froming on the lhs sill. I am a complete novice when it comes to doing >bodywork so here are a couple of questions > >When I've got the sill down to bare metal, what do I do to the dark pitted >areas where the rust was? >Do I just paint over it, or treat it with something as I don't want the rust >to return soon after doing the job. > >Thanx in advance > >Damian >