Last September we purchased a Red '90 Turbo Grand Prix and it has original paint on it except the "ground effects" *bumper, door mouldings* were repainted. Now by the gas filler cap whenver gas is accidently spilled on the paint and wiped off, it leaves a black "residue" on it that won't come off with just water and wiping? However, using a harder cleaning solution or some polishing compounds, such as Laquer Thinner or Nail Polish Remover or the Liquid Glass Polish we have it brings paint off. Is only happens on this bumper and not the fender itself which is the original paint still. The question is, would this be a sign of a bad paint or paint/prep job? It looks normal after using one of these cleaner and clean it off good/wax. Is there anyway to fix this problem or is repaint the only way to fix it? http://home.earthlink.net/~z284pwr/grand_prix/November 7, 2004/grandprix 009_resize.jpg You can see that the paint looks different in that picture *just below the gas cap* from the rest of the bumper, after cleaning it off it looks like the rest of the bumper in the sunlight.