I realized today when I was searching for the third time for my can of Krylon matte finish spray, that I needed to get this out into internet land for the good of all crafters. Please, go immediately to your crafty outlet, big box crafty store, or dickblick.com and buy yourself a can of this. It will make all of your painting projects complete. Anything that has the potential to be sticky/tacky will benefit from this stuff. You just spray a quick burst and it will instantly protect your finish from fingerprints and sticking to other surfaces. It dries super quick. We even use it at work to tone down the glossyness on some plotter prints.
So this is my crafty secret for now. Please, heed my advice, you won't be sorry. :)