There is this big misconception that you first need to polish the headlights super smooth before 'sealing'. All you need to do is abrade off the UV damaged layer and smoother it sufficient for the clearcoat to smooth out the sanding marks. Waterproof 600 grit is more than sufficient. Actually the smoother you go, the less the paint has to grab in to. Especially when going 1200 or even higher. Car painters never sand a car that fine before applying lacquer. These high grit papers serve to prep for polishing. Over polish you apply a wax or similar. Headlights need a paint that blocks UV. Best use a 2K equality paint (come in cans too)
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