If you work hard enough, you can polish aluminium to a mirror finish.
My steps for the disc I got. and materials.
truing stand
paint remover and scraper
Water Bowl
Sanding block
220,300,400,600,800,1000 grit sandpaper
polishing compound ( the white stuff)
mothers AL polish
auto buffing power tool with the wool and microfiber pads.
Step one: remove paint
Step Two: mount in truing stand that is bolted to something
Step Three: wet sand with increasing grit by rotating wheel, rinse your sanding block often and change water between grits
Step Four:Buff with polishing compound and wool pad. remove compound with microfiber pad.
Step Five: Buff with mothers AL polish and microfiber pad. remove polish with microfiber pad.



I took this picture before I polished it a few more times. It looks even better now.

It took about 8 or so hours to complete.

I imagine you could do the same with cxp-33's with less time, just dont use the truing stand and do it before the wheel is laced.