The concentration of pyrethrins in a typical wasp spray isn't all that high, but the amount of material in thei stream which hits the insect may weigh as much as it does; even in a small concentration, the insect will get a huge dose of the poison relative to its weight.
...I can vouch for the pain the time I was sprayed with OC: my eyes quickly shut from the swelling and the desire to avoid more pain, I could hardly breathe because it felt as though my throat was swelling shut, my entire face felt like it was on fire, my lungs felt like they were going to spontaneously combust, and the only thing I wanted to do was escape to a cold shower to get the stuff off of me!
...So there you have it: insect sprays simply don't work as defensive devices, they don't deliver their payload to any greater range than does a good OC spray, and are illegal to use for anything other than their intended purpose.
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