You could always take the film to a printers and get them to print your designs for you, modern inkjet pigment has a reasonably good uv resistance and you could always add to that by using a uv resistant clear coat over the top. If you look at any car that has sat outside for ten years the paint will very noticeably faded compared to 'as new' so it's not that big a deal. Never heard of plastidip and had to google it, wtf?! I see why it didn't catch on, most people don't want their pride and joy dressed up in a gimp suit!