Most of the home improvements stores have a paint on application for tubs.
I would call a pro for refinishing tubs.
It's pretty technical.
I've seen a tub when it was a few years old and it was refinished.....didn't look good....many water bubbles under the paint and it would pop and old finish would come through....
Thanks for the answers, but I'm still hoping for more ideas.
My daughter and her husband bought a house where the bathtub had been painted...what a mess. They opted to have it professional redone and it looks great! It was a lot of work and the fumes were awful. They were extremely thankful they called a professional rather than trying to repair themselves. With that being said I think rather than try repairing it yourself you may want to at least talk to a professional and get their opinion. I don't think there is any 'easy' fix to redoing a tub.