RENEW/POLISH POLYCARBONATE HEADLIGHTS

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My car headlights was spoiled by age and sun..
On my previous car, i only polished headlight but they resisted only an year.
This time i used a specific spray transparent paint.
Don't use generic acrylic paints, 'cause they aren't UV and heat resistant.
On left headlight, i used three grades of abrasive paper, 600-1200-2000, and then spray paint.
On right headlight, i polished surface, over using abrasive paper and finally painted it.
I wanna see which headlight will resist more time.
I advise not to do this job with enviromental temperature below 18 celsius degrees.