I use this resist film called PNP-Blue, google for info on that. Print out the background of the artwork in reverse (because you need to iron it on so then it will be the correct way again). Has to be printed with a laser or photocopier. Then touch up any spots or blemishes with a paint. Into an acid bath of Ammonium Persulphate for about 30 mins and viola! This plate was steel and i tried various different acids but this was easily the best of what i had at hand. It came from an electronics store to be used for circuit boards. Only my third effort thus far so still a way to go, plus been awhile so forgot some of the tricks i learnt last time!
Didn't take pics of this Sega job but here's some from the last time about 3 years ago. Made this Bussoz "La Girouette" name plate as a gift for a friend in Melb who was missing it. He'd done me a great favor picking up and packing a huge leaded glass chemist sign I'd bought over there on eBay. I once had the original plate turned backwards on a revamped Pinup Girl to copy from. This plate is etched brass by the way but doesn't look like it here, then plated and aged to suit the rest of the machine in the finished photo.