I painted the ones on my K3 naked with Simoniz 5 Wheel Silver paint (available from any decent car parts emporium) and then lacquered them. Once it had hardened off I polished them down with MER car polish. Unless you had one with original paint sitting next to mine you'd never know the difference.
For touching in the paint on the the silver subframe of that bike I used an aerosol can of Smoothrite silver, it was a perfect match for the original. I didn't paint the whole subframe, only where rust had appeared round the pillion footrest mounts.
