I have done maybe a hundred or more headlights , tail lights and light bars. Unless the damage is minor , I start with 800 on a 3" DA, go to 1000, 1500, 300 Trizac and then buff and polish with 3M Perfect It steps 1 & 2. I then use the 3M clear wipe to coat them. I have used other products but this works best and is the most consistant. I tried to upsell someone on fixing their headlights. They replied that they did them themselves and thought they looked great. I offered to do them and the person would not have to pay if I didn't improve them, they paid.