Has anyone's horse experienced allergic reaction/collapse after being sprayed with Bronco fly repellent?

I have owned many horses, but I have only had one that had any type of reaction to that specific spray. I actually do not use chemical fly sprays anymore after it caused raised bumps all over my horses body. I went to vinegar water. Totally natural and safe. I can even put it on lactating mares. Very safe. It smells, but I have had such good luck with it I wont use anything else.