On my first Dumble clone, I had a print shop screen the labels directly onto the black powdercoated chassis. They complained that it was very difficult to get the screen flat on the chassis because it wasn't perfectly flat but they got it and they looked great. They've also been durable. But it was enough of a warning that I went to separate faceplates for all of my amps after that. The 18W amps get a 1/16" plexi faceplate while the Guytrons get a thin stainless faceplate. These are much easier to print.
