Is it worth buying a DA polisher to apply the Pro-Tec Polish? I had elbow surgery this year and was thinking about buying one and saving some wear and tear on the arm. I don't need to use the Nu-Paint as the finish is good and the water spots that I have will come out with the water spot remover from Pro-Tec. If it is advised to get a DA polisher what would be the propper pad to use for applying the polish? TIA