That is what rotory induced swirl marks look like. These were post by a member at Autopia. They were taken at a car show. I for one would never enter my car in a car show if it looked like that.
Those pictures effectivly demonstrate why you need to really know what you are doing if you attempt to use a rotory buffer. The Porter Cable random orbital polisher is NOT a rotory. It is perfectly safe for an amature and could never cause swirling like that. That is exactly the kind of damage I have to repair every week from nut jobs who go buy the cheap 30 dollar polisher at WalMart and think they know what they are doing. By the time they pay me to fix it, they could have purchased a PC to begin with and could have done it right the first time.
Lesson for today: PC=Good Rotary=Good if you know what you are doing.