Me too. I don`t know about plastic, but in my experience, M105 has always left a finish that "needs more work". Just like a lot of classic compounds do.
Speaking of lenses, do those of you that regularly do this chore worry that you are cutting away at the OEM protection on the lens? Sure, if it`s hazed or yellowed, then polish and seal it. But if a lens is shiny with a few rids, should it be left alone?
I have a great friend in Seattle, who is the best boat Detailer up there..
He has been cutting gelcoat with only Rotary Power for decades..
He only uses compounds and polishes after, to clean up gelcoat.
He routinely wears out the best DeWalt Rotaries and has been an advisor to DeWalt to help improve their Rotary products..
He never gets micromarring, etc., in his work either..
His work on any black boat rivals the best work on Jet Black paint.. I have seen many boats he did and they are all amazingly clear and glossy.
Since there are so many variables to account for when doing any correction, which one may need more work ? Which one needs a different pad/s ? A different compound, polish, speed, pressure, technique?
I ask myself these questions, everytime I go to work out there..
Regarding taillights ---
I have never in all the decades of polishing them or looking at them, seen any taillight with sun damage like I see all the time with plastic headlights...
Perhaps in sun-only states, there may be such a thing as sun-damaged plastic taillights, I don`t know about that..
Dan F