[Kotomi]

 Thats the actual idea.
 
 Never knew people had skin reactions; so might have to change the stuff.
 I did't know that but thank you.

It's just the spice. Some people are so sensitive it can burn them... But if you ever used this in someone's eyes it'll be ~ normal pepper spray (us grade is around 2-5m)

 If I was to mend pepper spray homemade, I'd obviously have to test it.
 
What would be the most effective but safes pepper to do this with?

Carolina is probably enough on its own.. 

I believe it's the hottest in the world?

Theirs no fall backs like people being allergic or anything?

Everyone is allergic to peppers that's why it burns.