It will be like fixing chipped nail polish- it doesn't really work to put touch up on scratches without doing a lot of work to work it up to the same level as the original paint. Bumpers are more difficulty than body parts: Fill the chips with body filler, sand that level, prime it, sand that smooth, spray color onto it and cear-coat that when it's dry and even. The Billy Mays stuff is not for the damage you have. Not at all.