Well, if we are talkinf about the methods of painting plastics like in a body shop, you would just need a can of flex-added spray primer, a can of flex added paint, and a can of flex-added clear coat. That would give you a really durable and forgiving finish on most plastic items, the primer being the real key. The problem lies in that there are no automotive paints that I know of that could hold up to the friction they would get from the cycling slide. not to mention it would take up to 30 days before the paint was totally cured.
Just did a bunch of paint work myself, so I spent a lot of research time on it.