Which brand kit did you use?
Did you follow the instructions precisely? I'm guilty of being impatient myself and not following the directions to the letter, but they give instructions for a reason.
Depending on the extent of the "fogginess," you might have to wet sand to the highest you can find (2000 is the highest I can find at local stores) and then polish again to get them clear again.
Or try a different, maybe higher brand, of headlight restoring kit. I've recently been introduced to
GlassyLite, looks promising and I plan on trying it out soon.