Decoupaging Plastic?

[rivulet.livejournal.com]

I have a small (2"x2") plastic pocket mirror that's flat and folds rather like a compact. I got it from Mom when she worked for a urologist many years ago, so it has a prescription drug logo on it that has all but rubbed off. I'd like to decoupage it, but I'm not sure if Mod Podge sticks to plastic very well, and I don't want to ruin it since it fits in my purse really well. Does anyone have any experience successfully decoupaging onto plastic?