Only just spotted this follow up from our original conversation. Certainly looks effective. It would be interesting to see whether it will reseal while still partly full. If it does, you would be able to let a big dollop out, then wait then another dollop etc. By having someone else control it, the victim wouldn't know when the next dollop was going to be released, or you could use the same technique to move around to get covered where you want it etc.
Love you, too
