Ceramic coating is the way to go(they even have colors), but be sure you have it done professionally. It cost a little more, but it gets done right. I did a lot of my parts that were steel and they look so much better. You also avoid any rust issues due to the prep of the pieces(bead blasting). Any aluminum that you don't want to "age" should be coated with Zoops Seal. Most of my rear pieces came either spray painted or powdercoated. Overspray was everywhere. When I cleaned the car up, I covered most with primer til time to do the deed. I knew there would be at least ten times the stuff would be put on then removed before all the mods were done. Saved nicking them up, as you can see with the primered parts. The trailing arms have been replaced with totally adjustable units which will be coated in the next week or two.
Bill
Bill