Our city animal control officers don't carry spray anymore. Turns out, an animal intent on getting you is so focused on the task that they will charge right through the stuff. Pit bull terriers, and other attack dogs show no effect. Cattle prods, darts, and pistols are what they carry. Apparently the prods work like a stun gun or Taser, and are very effective. I've often wondered if a spray would work fast enough on a seriously intent bear, before it got to you.
(Texas bears are one notch above raccoon, so no problem here. )