Use a battery operated drill and not electric. Kit comes with 500, 800 and 3000 grit. I added 2000 before using 3000. It took about 2 hour to do both sets of headlights and here is the result. Car pictured is a 2004 Honda CRV with headlights I replaced from wrecking yard donor. The other car was a 2008 Honda Element with original headlights that were cloudy and we had the same crystal clear result.