The army engineers used to entertain themselves by firing golf balls straight up in the car park. As a kid i recall loading one with a passion fruit and blowing a skateboard in half with it. Much safer to stick with cheap hairspray if all you have is pvc. Then again i did see somebody come a cropper with pvc spuddy - his shirt was ripped open and he had frags in his side. Douche-bag didn't wait for the glue to set.