^Let me answer this from Lurker's point of view as a business owner. Strip it and anno it. If it works, cool. If it doesn't, buy a new bolt.
Seriously though talk to an anodizer to see what your options are.
Assumption is the mother of all **** ups.
"Thats a lot of Romans over there." "Yes but not one of them is Gisgo." Hannibal Barca and general Gisgo before the battle of Cannae in 216 BC.