I have a pair of Triumph stock mirrors that have some damage and I have decided to strip the chrome off the mirror shafts and will be prepping them for a paint job of matte black while keeping the heads chrome. So far in the stripping process I have ground it down to a multichromatic rough variation of the chrome which I think is about as far as I would like to get down to in order to apply the primer and then the matte black. Have I gone down far enough or do I need to grind more?