When using any kind of rotory polishing machine, I would wonder if I were work hardening the surface being polished. Being an old machinist, I think about that stuff. One thing I'll agree on, polished aluminum airplanes are beautiful to look at. Another experience comes to mind about polished aluminum. I was in a large formation of Cessna 140s several years back. It was a bright sunny day and the polished aluminum airplanes were very hard to see against any ground clutter. It was like you'd look away for a second then look back and they were gone, but they were really still there.....Oh yeah,....there he is. Well, I guess it was more of a gaggle than a formation.
Bob S