acrylic paints always scrape right off of my acoustic, which is pretty cool. I get to paint it like new all the time.
If you want it to be permanent, you'll have to sand the clear coat down a bit, and then paint it on, you can use either one, but air brushing is recommended. After you do this, you'll have to re-apply the lacquer and then sand it with high-grit sandpaper if you want it to look good.

www.reranch.com has some good tutorials.
Quote by Pinky&The Brain

Are you pondering what I'm pondering pinky?

I think so, Brain, but where would we buy rubber pants at this hour?