So i will be completely refurbishing the paint on my 2002 bmw 325 that I just purchased and had a few questions. It has only a few deep scratches and huge amount of swirl marks. It is black and i will be starting once I get my hands on a good priced used porter cable. My number one question is what line up of pads and polishes should I use to complete the polishing of the car. They are pretty severe swirls if that helps at all. My second question is, I clay barred a few parts of the car that were pretty noticeably in need and as I am going to be polishing it soon didnt see it as a problem. But what I noticed was that my clay bar wasnt aggressive enough to get EVERYTHING out of the paint. It did a good job but is not perfect. Should I use a stronger more aggressive clay before I polish or is that not a good idea as I have heard you shouldnt use aggresive clay on black paint. Thanks for all the help in advance