Well, I got done with my detail, but I noticed when i got done with my roof, my pad was a dark grey color (my car is a 99' Grand Prix GT, silvermist in color). This only happened on the roof and I was wondering how you know if you polished through your clearcoat. This is the first time to my knowledge that the car has been polished. I went over it with 1zUPP and a yellow pad as much as 2 times, and followed up with 1zPP and 1zMPP. The area in question has an excellent shine to it, so I think that the color came from when I hit some of my sunroof trim. What do you guys think????