What's the deal with coloring CD's and/or tray mechanism

I just stumbled across an old thread discussing this process, and the sonic advantages. It's intriguing, and I wonder what other members think. I am primarily into vinyl, and don't listen to cd's that often, but if I can improve the audio quality, then I am interested, to say the least.

I am concerned though, about painting the tray of my McIntosh, for fear of damage, and also de-valuing it's re-sale value