craftgrrl | painting tailgating tents

**EDIT:** I added a picture in case people were confused about what kind of tent I'm talking about.. they're just set up in parking lots before college football games.

So ours will be like that except plain white, and we want to make it look festive by painting it.

I was wondering if anyone has had experience with painting a tailgating tent. I looked it up, the material they are made out of is called "polypropyline."
My questions are:
1. What kind of paint can we use that will stay put?
2. If no paint will work, what about sealants?
Thanks tons for any replies! Will post pics after the fact.