Hello together, recently acquired a used Toyota Corolla built in 2001. Now I noticed, with a close look, small stings or varnish bursts, on which the vehicle seems to rust. Pictures of this are in the appendix. Now the question: how can the damage be assessed? Is it enough to spray on it just a little rust converter, and then to provide the small places with primer? Or does it have to be done differently? I would be very grateful for advice.