Apply a compond or tooth paste and stary your polisher at about 3000 rpm give it a few passes. Remove the remaining priduct and see if your happy if not do the same again buut increast the speed to 4000rpm and keep going till your happy. Thats how I did mine.
I wouldn't use such high speeds as mentioned above as you will melt the plastic if held for too long or too much pressure applied
For plastic lights I use speeds of less than 300rpm, yes it's possible to use higher speeds, but I'd rather keep them cool and get it right than melt them! If you get 'water like ripples' you getting too hot!
As for compounds and pads the list is endless just as it is for paint, but yes paint compounds can be used on plastic, just start with the finest you have
Also consider wet sanding before polishing to smooth things out. Again start fine, work course if needed, finish with fine somewhere above 2000 grit ideally then hit it with the DA and refine
I've heard of the tooth paste method before. Plastic-X seems to be highly regarded. I've got some to use on on mine and a drill bit polishing pad that I bought from eBay. Haven't tried it yet though.
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