I am tossing around the idea of purchasing either a dual action polisher, or a circular polisher... I know the circular polisher has the danger of burning paint, but I am afraid that if I pick up a dual action, then I won't be able to get my 10 year old paint to look it's best. There is a lot of Acid rain on the black finish and I want to do my best to bring the stock paint up to make look like new. Will the dual action buffer get the paint to look new again? Will I remove all of the acid rain? What are the limits of the dual action??