Three reasons you should not should not use Wasp Spray for self-defense.
1) It is against federal law to use wasp spray for personal self-defense.
2) The person you spray may sue you for violating the law.
3) Although wasp spray works to kill insects, people are not insects.
My recommendation is to invest a name brand pepper spray around ($9.00 -$15.00).
Last please leave that $1.00 non brand pepper spray alone you found at the flea market. It is probably expired or junk. This is probably why you are getting it at a discount.