I bought a used 1911 that had some rust on the slide and around the rear Novak sight. I bought some Bullfrog to take off the rust, which it did really well. However, it took all the black off the sight as well. Are Novak sights painted or blued? I am assuming painted. Can I take it off to repaint it black? Or does it need to be blued? What would work best? Thanks.