bthoff, Rattle can or repainting any old bike is; to collectors, a forbidden sin.
It ruins original characteristics an identity and in most every case is good money wasted as, in terms of collectible value, does not increase monetary worth any more than it was before painting. U could say, take a 100 year old bike into consideration, old beat up original paint is prized more than repainted stuff, nostalgic.
It may improve appearance but, unlike original baked on factory paints, if it's put back in service as indented originally, chips easy and looks like junk again.
Yet there's the golden rule: It's your bike and U can do whatever you like.