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Having restored a bunch with sandpaper, I can tell you that you will get 10x better results that the pic above. Of course, its also a lot more work.
I would stay away from clear film over headlights, because some Z4 owners have experienced cracking in the headlight lenses due to excessive heat build up.
If you want to seal them (and you should after polishing like that or they'll go back to being crap), use a 50/50 mix of spar urethane and mineral spirits. I know it sounds crazy, but it works awesome. Read the link I posted above for more info.
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