That's good paint! Wait a couple of days after you painted and then you can re-spray
Just sand as I mentioned beforehand and make sure to clean the keyboard really well. Don't use rubbing alcohol on the paint, it will melt it / make it tacky. You can just clean it with light detergent and water if you got it oily with dirty hands or what not.
Awesome. I wonder if I could do the same for that little spec of dust.. it's really noticeable and it's bothering me. 
If you haven't clear-coated it, yes you can. Just when you put paint over the sanded areas, don't do focused spraying into one spot, or you'll end up with too much paint, which will run and sag. Go from a distance, at least 8-10" in a light sweeping motion. Better to do a few light layers until it looks even.
Ah.. I've already clear coated it. I think it landed on top of the clear coat as it was drying because it wasn't there before I used it.

Oh! And thank you for the Rustoleum suggestion!

)
I went ahead and (tried) spray painting the bottom case for my QFR with Krylon (~month old, was basically full).. Ended up basically ruining the entire bottom (unless I sand the paint off, or use some of that Easy-Off stuff).

Close up:

A horrible macro with my kit lens:

This was the color scheme I was going for:


Will be adding some white thick PBT's soon.
Err.. my spoilers aren't working. Sorry for crapping your thread with tons of pictures.