If it's a new AMERICAN MADE lock, it's not paint you have, but rather the finish the lock makers are putting on them. Its glass bead blasted, and to remove it you will have to file itwith needle files to get it off. As you break through this finish and see the metal under it, you will see the parting lines from the casting process, these should be removes as well. Then using an abrasive paper backed flat surface small enough to get each of the areas on the plate, cock, pan, and top jaw. The abrassive paper grits can be 220 to get the needle file marks out, then 320, followed by 400 or 500 or 600 grit paper, depending on the desired polish you want. Some makers put it to the buffer. Some makers don't bother and brown the lock, the beaded surface takes the brown well. I prefer to have a polished plate and parts. It's time comsuming and gets your fingers dirty, cramped, and sore. But I like my locks like that....Hope this helped. ....George F.