I mean, as far as practicality goes, should I really worry about repainting if there's no rust from the scratched spots? I really don't want to deal with this, since I know that if I get a new paint job, my OCD will kick in and I'll freak out whenever a scratch appears. Right now, I don't have that problem since it's an 18 yo paint job. Also, how well does fingernail polish do as touch up paint?