Working on one of the winter projects: Repainting the Trek 500 and after stripping the paint (99.7%) I found a lot of surface rust, the bubbly, pop the paint up kind. There is quite a bit around the lugs and along the top tube around the cable braze-ons.
I've been hitting it with a wire brush attachment for my drill and most of it's coming off, but now I've been through two batteries and my arms are tired. So I ask you this question:
Is there an acceptable amount of rust that can be left on when re-painting?
I've got an idea of what the answer will be, but before I head down to the hardware store for some oxalic acid I wanted to get some sort of definitive answer. Thanks.