The previous owner of my car did the worst job taking care of his Z.. The rock chips on my front bumper were UNREAL! I decided to use Dr.ColorChip to do some minor repair but oh my goodness... It turned out SOOOO much better than I could ever expect. Here's the picture of the before and after. Top two photos are before and then obviously the clean bottom picture is the after. I was honestly so amazed. I recommend this product to EVERYONE with a black Z. Not sure how well it comes out on the other colors but on black it works like magic.
http://i41.tinypic.com/vmvy44.jpg
ORDERING MY CLEAR BRA ASAP! Hahah just thought I'd share with you guys. $70 for removal of over 40 chips was way more than worth it.