Jeph, I have the exact same wheels as you and they are not smooth. The barrel is lined with very small parallel grooves running the entire circumference. My OEM 17s are mostly smooth but the surface is unfinished as Ronzi noted. GedC, are you wheels original Porsche or aftermarket? Regardless, 30 minutes per wheel is at least 25 minutes too long.
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2003 Boxster - Sold but not forgotten
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