I guess some of my black exterior pieces would qualify as "piano finish"..the "B" pillars of the A8/S8 and the sideview mirrors on the Tahoe. Smooth, very shiny, hard plastics.
I correct them as needed (which isn`t often, sure not annually), and do them with the Klasse Twins (numerous layers of KSG) and then maintain with the Sonus Acrylic Spritz.
Those are about the only black plastic/rubber bits that I don`t UTGG+ other than the tires and the bumpercover/beltline trim bits on the `93 Audi that *look* like textured black plastics but are really a satin black paint over whatever kind of plastic they are. Those wear FK1000P (which I thought might stain them, but no...all OK).
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