Mine is anodized in saw dust
As Will stated it would have to be stripped first, and should best be left to a plating shop if you want good lasting results. I don’t know what is done specifically to the factory rails, but I suspect it’s Type 2 Class 1 (Sulfuric acid anodizing, standard thickness, no dye added). In my work I’ve visited a few plating shops and honestly I wouldn’t want any of those chemicals in my garage. You could always get a pair of colored safety glasses and wear them whenever you look at your machine and pretend it’s a different color, less of a hassle and a bunch cheaper, haha!!