I'm a complete newbie about to buy the pc 7424 and intend to practice on my Subaru Outback wagon. I don't intend to use any pads with significant abrasive qualities.. just some light swirl removing, polish & wax.. but, do I have to worry about those wonderful plastic roof ribs and body panels ? I've read that "paint is paint" and am not too worried about the side panels.. but will a light swirl removing pad adversely effect the roof "ribs/bars" ? I know that I'll probably be hitting them with the pads. Other than that, I'm not concerned about striking out on this new endeavor. Thanks.