Yep, if you have pits or scratches you can feel with a fingernail, Mother's won't cut it. The factory alloy was rough to the touch, very oxidized but for a polish, it's a good product.
I did a test on the inside (not back) of the wheel, sanding machining marks down with 220, 320, 400 and 600 and followed with Mother's and it looked like a mirror.
