I recently bought an old road bike (1979), and the paint is in really good condition, except for an area on the fork where there's some rust, maybe 1 square cm. All the sites I've seen on the subject are about restoring all the paint on the whole frame, stripping, etc. I want to keep all the original paint that's on the frame, and just prevent this area from getting worse. I don't care about making it match the yellow paint that the rest of my frame is. Would I just sand the rust (or use oil and steel wool), then a primer, and... I don't really know.

Thanks