Fantastic script, Czar - Two seperate proggies from my main posted below, one directly after the other. Had to go buy more sharks between the two.
Not a single hiccup in my time testing.
Only (very) minor thing I noticed was the paint flickering when F3 is pressed. Doesn't seem to hide or show the paint unless F3 is held for several seconds.
Outside of that though, amazingly well done. Keep it up, my dude!