After I painted my calipers red, I wanted the hubs to look good also. So I used a small brush, used black paint and was careful. This was about 5 years ago and they still look great - No Rust. Also, when I painted the calipers, I also painted the outer edge of the rotors and down into the venting. It's not real noticeable unless you really look, but I like it - I had plenty of paint so the extra 5 minutes or so wasn't a big deal. If you want it to look really good, put a high gloss clear coat on all your work - it will look factory.