if the frame is stock from factory, it probably is not painted, but has a clear coat on it, that is tough and durable, but eventually does peel, chip, fade...
powdercoat is one way to get it nice for sure, but can be costly, depending on where it's done, only problem with powder coat is if it gets chipped, there is really no way of touching it up...
I will check out the 80's thread...