sand blast = removing the caliper which = bleeding brakes
im my opinion, its gonna get dirty anyway (dust),
just make em a lil prettier with the colour, but they wont stay like that..
had a mate do his one gold, high temp paint, its now orange and yellowish..
the heat got to it i guess...
another friend has done his wrx in red, looks good, just a little dusty..
but he doesn't drive his car often...
i've had a friend do his in red by just masking the caliper without removing a bolt..., looked good for a dodgy job..
anyway
what colour are you thinking?