If I had to do resto work on a playfield that required repainting etc etc, I would take the machine to a guy 20 mins away from where i live at a place called Underwood QLD, where there is a shop with a guy who is probably one of Australias best airbrush artists.

This guy does airbrush jobs on everything from motor bike helmets, bonnets of hotrod cars, wall art, you name it, he does it.

This guys airbrush work is absolutely amazing and i know that he would have an extensive knowledge of paints n applications on any and everything.

I dont think he would be that expensive either, cause anything i throw at him, would be a piece of piss.

You can try the stencil stuff with mylar over the top etc, but you may need paint work fading a colour in and out of an area and
thats where only paint will do.