I'm pretty sure that the HotRod and X-Arcade reverse print their control panel graphics on textured lexan film and then it is stuck down with some industrial 3M adhesive. I believe the lexan has a matte/velvet finish.
Professional print shops can do this and may even stock the lexan film.
A word of caution about this:
I used this material on my CP and it was incredible.....The key word here is "was"
This material is reverse-print, which means that you apply the glue to the surface you printed on. The thing that makes that surface ink receptive is a
coating that is applied to the polycarbonate. Once this coating is bonded to a surface with contact cement, the adhesion between the surface and the coating is stronger than the bond between the coating and the polycarbonate.
This means that if you snag an edge, even slightly, this material likes to de-laminate like crazy. You can literally peel the polycarbonate material away cleanly, leaving the printed graphics (the coating layer) and glue stuck to the panel (how cleanly it comes away depend on the uniformity of the adhesive layer.)
Needless to say, this is a "bad thing"
If you can adequately protect the edges, you might be okay. Otherwise, I don't recommend it.
RandyT