Has anyone had any experience lasering "hard" anodized aluminum? I need to laser 430 seat numbers for a performing arts center. They originally requested dark bronze with white lettering but I am not sure how to do that without painting the letters. I thought it might be better to use a dark bronze anodized plaque and laser to create the white letter. When researching the anodized surfaces choices, I discovered hard anodizing will wear much better than regular anodized. Any thoughts or experience would be much appreciated. Thanks.