Folks,
One thing to remember about pepper/bear/wasp sprays is that they fill the air with tiny droplets of toxic/irritating liquids. They spread rapidly due to pressure and heat variations. If you were to spray someone in the door or interior of your trailer, it would only be a few seconds before some of the droplets reach where you are.
On pepper spray packages the advice is to spray then leave the area immediately.
I once tested a pepper spray, then removed a little piece of fuzz from the nozzle. A little while later I unthinkingly rubbed my eye.
OUCH!!!!!!
Another thing to remember is that some people are able to resist regular police level pepper spray due to drugs or whatever. I once saw a youtube video where they were pepper spraying female marine trainees in the face with pepper spray, and then making them fight another girl with pungee sticks. Think a 5 foot pole with big firm pads on both ends for hitting you in the head. The point is that these girls were able to do it!
Tom