I'ts not an easy or quick process. Used exactly as instructed, it will still require a cew bucketfuls of elbow grease, but it does work. What it will do is smooth the top surface. If there's anomalys in the surface beneath the top coat, it won't do anything for that. Overspray is just that, over the top coat spray. Color sanding is an option as stated, also not easy, and not fast. Requires buffing equipment, doesn't work well if at all on tight areas with lots of corners, as shown, primarily for use on larger flatter panels. Easiest thing to do is throw a bikini top on it and not worry.