I'm sure all will concur here, not a very good idea at all. I can understand aesthetics-cosmetics, and a table "looking" nice, as most of us want our rigs to bear a personal reflection of us, just like many like personalizing thier vehicles.
Firstly, I'd be worried about the paint reacting with the Platter material, and just as important, reacting with the Vinyl you place on it. As for sound, the bottom line is what are you trying to achieve?
The paint can, and will in time scratch-mar-chip.
If you want to change the sound on the cheap, try some Platter Mats, the Herbie's Mats comes to mind as a good one to try.
Or, how about something like the McIntosh Table, placing a few blue LED's under the Platter?
Mark