I
Worked in a plastics plant when I was younger. We sprayed a liquid adhesive on plastic. We applied graphics and scraped on like the tattoos you use to get in gum packages. I imagine it it'd a very similar process for the graphics.
If we messed up on peeling the graphic we'd have to spray it off and clean it off. We'd spray with alcohol to prep the surface and apply the graphic again until it was on satisfactory. I learned to get it right on the the first application.