Hey, all.  I'm more or less a papier mache duffer, and I'm using papier mache for a purpose that will horrify the more artistic among you...so if you can't stand horrible sights, better skip this post.

Still with me?  OK.  For reasons that are too complex to go into here, I have been tasked with creating the head for a dummy that is mounted on skis, and that will be sent over a jump, with maximum destruction being the objective.  Since my team wants to make a big impression, they decided that the dummy's head should be filled with fake blood, the idea being that it will fall off after the dummy goes over the jump and will splatter gore all over the hill. In other words, I'm making a papier mache head for the sole purpose of destroying it.  Think of a pinata, only instead of having nice sweeties inside, it's got a big bunch of yuck.  Happy cinco de mayo!

Anyway, my first idea was to make a simple head using a balloon as an armature, and then filling it with a flimsy supermarket plastic bag which I would then fill with fake blood.  I did a trial run today (using water instead of fake blood, I don't want that yuck all over my yard), and while the head shattered satisfyingly, the bag didn't burst.  So now I'm wondering if it's possible to waterproof the INside of the head and fill it with fake blood shortly before launch.  Anyone have ideas of how I might do this?   Or how I might rig it so that the bag will burst open?

Thanks for any help -- my team will not forgive me if that head doesn't explode blood on contact with the ground!