You can purchase sheets of white decal paper and apply them to your enclosure, followed by several coats of clear lacquer for protection.
Alternatively, you might prefer a simple sticker approach, as I demonstrate in the video below. These can also be lacquered over, or you could try a glaze or even a light coat of Armor All—just be sure the paper is fully cured before applying anything on top.
Some users have reported inkjet smearing, but I’ve personally never encountered that issue.