Has anyone come across anodized cog spacers for Shimano/SRAM 10-speed cassettes (or any cassettes for that matter). Just so it's clear, I'm talking about the 2.35mm (on Shimano/SRAM 10) spacers that fit between the smaller loose cogs.
I think you would be better off just prepping and spray painting the ones already on the cassette. It's not like they will be in contact with anything (on the top of the spacers) that may scuff them up. Sand them up, paint them, clear coat. I painted some hubs that way, they were not loose they were on a completely built wheel. 5 years later, no flaking, chipping, cracks.