Each to his own about how much personal safety to take, I guess....
I still use acetone to clean epoxy glue off of my hands, and don't worry about the times I spray epoxy paint outside with no protection. So no nervous nelly.
But this stuff can do serious long term damage pretty quickly. If you can smell it, you are way over exposed. An automotive paint type respirator is a great investment, and given all the other costs for our hobby, not that expensive.
And while a spray suit might be seen as overkill, they are really, really cheap at the local Home Depot...so why not? Besides, they keep the dog hairs on your shirt from drifting into the paint job!
Me? I may use it again someday, but generally will stick to true epoxy fuel proofers, like Klass Kote, for my airplanes.