What paint to use for Spiderman costume?!?

Im doing a costume thing with a group of kids and Im the black spiderman. Im getting a black spandex body suit and Im going (or wanting) to paint the web and spider logo onto the costume... But the problem is, what paint can i use that will definitely stretch and how do i apply it (stretched on application vs. not stretched when applied)? So yeah... thats pretty much my entire problem. Any input on this is greatly appreciated!