I was under the impression that Classic Arcade Grafix also laminated their artwork, but indeed it doesn't say so explicitly on their FAQ. Marquees and Bezels are mentioned to be laminated and in the bit about CPO's it says "The control panel overlays(CPO's) we provide are on self adhesive vinyl and have a textured feel to duplicate the feel of the original panels" and the line below they say it can be used in a commerical environment. I guessed the textured feel came from the laminate.
Maybe an e-mail would explain things. Or maybe the people on the thread about them know.