Haha, practice first. Seriously, try it on anything before you do it on what you are trying to make. It might sound kinda basic but I didn't try it first, and just went straight onto my first painting in the series, and almost seriously messed it up. Maybe I'm stupid and you know to do this, but seriously don't ruin it by doing what I almost did. Spray paint never works they way I think it's going to.