I decide to take the pics because I had heard of a few having problems when trying to sand their headlights. I think the trick is to make sure that you don't move on to the next grit of sandpaper till you have taken off all of the scratches from the previous girt of sandpaper.

Basically you're using the roughest grit to remove the pitting and all subsequent grits and polishes to remove the scratches from the previous girt.

To make sure I got all the scratches out I would sand perpendicular to the previous grit's direction. For example: I sanded horizontally with the 400 grit. Then I sanded vertically with the 600 grit till all the scratches were oriented vertically. If I saw any horizontal scratches that ment they were there because of the 400 grit and had to continue sanding with the 600 till they were gone. Then the 1000 grit went horizontally. Etc.