Do not use wasp spray for self defense. Just like birdshot in shotguns being for birds, wasp spray is for wasps. Proper name brand OC spray is pretty cheap on Amazon. Don't get the fogger, get either the stream or foam, it's less effected by winds.
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Fox Labs OC spray is pretty cheap 1.5oz can less than 30 dollars and is a well known name brand. Sabre also makes OC spray and you can get a 1.5oz can for about 15 dollars on Amazon.
And before someone says use bear spray. Bear spray is regulated by the EPA where as self defense OC spray is not so the concentrations of bear spray compared to consumer self defense spray is quite a bit lower like .18-2 percent where as there are self defense sprays out there at 10 percent. Advantage of bear spray is larger quantity vs self defense spray.
There's also the legal aspect of using what's classified as a pesticide (either wasp spray or bear spray, yes bear spray is classified as a pesticide) on another human. Granted you gotta do what you gotta do but why give the prosecution or the other guy's lawyer more ammo?