Retroplayer:
Malcom,Pulsar makes a film that would do what you want. But, you simply transfer the film and leave it. No spray painting required.
Now that's an interesting one. I'm not sure how they get all kinds of colors even though it says you print with a black and white laser printer. I'm very intrigued and will look further into this. So the plastic transfer gets left behind though? That may be a bit of a bummer. Most my enclosures are aluminum boxes and that may look funny because you'll see the clear plastic transfer on there. I'll look into it though. Have you tried it?