So I am in my garage, oh, about May of 1998, cleaning up, and I find a can of pepper spray that is about 3 years past it's expiration date. I open up the garage door, and, hey, there's no breeze, so I "push the button". Fog/stream comes out like it is supposed to, as advertised. Breeze kicks up and blows said fog back in my face. Product works as advertised, definitely not for tacos or omelets. This is the Mk II stuff that the cops use, 2 oz can or whatever. I had runny eyes for about two weeks, because everytime I went into the garage, the residue from the initial spraying acted as advertised. DO NOT SPRAY THIS STUFF INSIDE YOUR HOUSE, especially if you have a wife, children or pets. The will be very aggrivated to say the least.
Now I have the Bear Repellent from one of the more well known companies. The main ingredient does not break down, much, but the propellent can leak, as previously stated. You are probably ok for a year or two after the expiration date, but do you want to risk it?
Best Regards,
STeven Garsson