What'd you use? I use to do the headlight resto kits for a couple of places I worked and they turned out pretty nice when I took my time. I only got paid a 1/2 hour to do it though so I bitched the whole time I was doing it.
How long has it been since you did this? How bad were the lens when you did this? Does it still look good today?
Did it on my Lightning that I sold and a buddies Civic. I had the car about a year and it still looked great and it was a BIG difference in change. His car still looks fine too. I heard it worked because of the abrasive compound in it. When you rub it on you rub it pretty hard and for a while till it makes a pretty good looking haze then use the speedball to get it off. I doubt it's the best way to do it but it seemed to work.
The finish that you apply after wet sanding is like a clear lacquer. I've done some that looked terrible, the light that made it through the lens was very dim, and after I was done they looked brand new.