i don't want to kill anyone either. that's for sure. paintball pellets wouldn't even break a windshield. it'd just be like a huge bug smashing against the windshield. but they'd know where it came from. so they'd back off.
but i like the liquid idea. might be better, in the end.
i'm worried about the fogger, since i'm afraid of catching my own bike on fire. but i'm sure if it was done right, that wouldn't happen. theyre's a downside, though ... the fog might also mean you can't see how much closer they are from you ...
liquid projectiles of some sort sound better, in the end.