Please vote for my instructable: http://www.instructables.com/id/Easy-Permanent-Print-on-Metal-at-Home/ But what's in it for you? When we win, I'll be giving away an Ipod and a Dremel to lucky viewers! I use a laser printer resist and ferric chloride to permanently mark electric control box. This technique allows you to indelibly print on any metal. It looks very professional and the more careful you are the better the results.