Then you're going to have to get mechanical in order to restore the paint. I can't directly speak to using an orbital buffer as it's on my to be acquired list so I can learn/play with it on my falling apart paint before I mess with a repaint on the truck or another car with better paint.
Long write-up but it's basically all the same no matter what product you use once you get to the buffing, there are some really good videos on YouTube as well. http://www.autogeekonline.net/forum/...pc-7424xp.html