I have been detailing, paint correction and painting for quite a few years now. Gamedog has given you some very solid advice, as my polish of choice is always menzerna the 105 and 205 recommendations gamedog posted are right up there with the menzernas and they are more locally available. its hard to damage paint, single stage or 2k with an orbital, its all about starting with the lightest cut and pad you have and working your way to more aggressive until you find the winning combo to correct the marring.