Originally Posted by jaylogs
I just bought the 3M kit and used it today...all I can say is WOW!!! My lens were REALLY bad, living in the Arizona sun just cooked them, and the car is garaged! I did the worse one today and it looks like brand new! Like everyone says, it takes quite a while, in fact, I had to get another kit because I ran out of the 500 grit pads, that one headlight was that bad. But if you follow the directions precisely, you'll get very good results! 
Jay
You know, you didn't have to buy another kit. You could use *any* 500 grit sandpaper.