I asked Rhino Liner that one time and they asked me why I would want to
Anyway, they didn't have a good answer. I had paint remover I had gotten from Eastwood for Aluminum (aircraft). Liberally applying and allowing it to soak in, the rinoliner lifted up and could be pulled away like a rubbermat (at least in most places). In some it required the addition of a scrapper. Bottom line - it isn't easy and you will have to soda blast(which I suggest for aluminum) and reprime and repaint.