I have a black 2001 GT and my brother has a red 2001 GT. I've noticed that just about anything will take out scratches, swirls, and imperfections in his car yet will do little or nothing for mine. Black is definately hard to take care of keep looking good. It takes lots of work and I'm hardly kidding.
I've tried about everything known under the sun on my car and NOTHING has yet to take out all the swirls and make the car look magnificent. I've tried Meguiars number 7, 3m rubbing compound, 3m swirl mark remover for dark colored cars, Turtle wax pure black polish, and Mothers sealer glaze. The turtle wax "hid" the swirls momentarely until I looked closer and realized they were still showing. The Mothers did the best and I think the other products may would do well but I need to apply more pressure. I've been using a single speed orbital buffer on my car to make it look good, however, I need to get a faster one. This single speed just isnt doing it. I'm going to go to Sears and pick up a 3800 random orbit one with some foam pads. We'll see how I do then. Anyhow, I'll be sure to let you guys know what works then and what doesnt.