Here's a post if what Not To Do:
After I bent my brake lines at the master cylinder, a Scotchbrited them to give a brushed aluminum look, and I then I sprayed them with a satin clear to preserve the look. WRONG! It turned them a nasty dove gray, and they looked awful. So, I tore everything back apart, got the clear coat off with an aerosal paint stripper and re- Scotchbrited them. While I was at it, I resprayed the booster with some SEM satin black. I love SEM products. Now, I can look at the booster and not get spun out about the look of the brake lines. Muuuch better!