Searching the forums, it seems here is the best place to ask my question.
I have a Canadian made 86 Raliegh Grand Prix(black) - frame says 'cro-mo Tange 5.' Not a high end bike, but it's good for my conversion project.

There are some rust spots on the frame, mostly around the dropouts. I'm not particularly concerned about its appearance, but I want to stop any more corrosion. I've cleaned the whole frame and took vinegar and a stiff brush to the rust spots. It's degreased and dry.

I'm wondering if I should use a 'rust converter' product on it. I've read that it can dry rather thick, and I'm worried I won't be able to put the wheels back on! Anyone comment on this? I'm also thinking that the dropouts are prone to chipping/scraping and I imagine nail polish wouldn't last long - would the auto or 'hobby store' paint last any longer? There's also a couple rust spots on the seat and chain stays, so I'm thinking of trying a little rust converter on there as a test and see what happens, but any advice prior to this would be greatly appreciated!
Thanks!