For my panel, I used rattle-can paint, "cured" in the oven - nice and hard, and still looks great! For labels, I used a Borther labeller, black text on clear backing. The labels stick great, and if you rub them on well, the substrate is almost invisible, except under the right glare conditions. I considered silk-screening for the panel labels, but couldn't personally justify the expense - and I also found that I was changing labels right up to (and after!) the flight test phase. It was easy to make changes with the labels - would have been a lot tougher if I'd screened the panels. Maybe that's just because I was being indecisive!
Paul