Vid,
I have a United shuffle-targette machine I am going to repaint. I know it's not a pinball machine but I figure the steps would be about the same. I am planning on sanding to bare wood, fixing any imperfections in the wood, and priming with Kilz primer. I was planning on using latex for the main color coat and spray it using a harbor frieght HVLP gun. I know the paint will need thinned but what do you recommend for a thinner? Most I've read online so far say to use water. I worry that the additional water will cause issues with the wood. I did see one guy that used windshield washer fluid. Not sure on that one but seemed to work ok for him.