Well when working in the bush, I used to use chain oil on the brim of my hard hat and any flies that were bouncing off my face usually got stuck or added some oil to the wings if the bug brushed up against that area, every hour or so, I would wipe the millions of bugs off and apply more chain oil, this really helped to keep those little bugs out of the face and less to fly in my mouth, for the rest of me I would wear long sleeves and pants.
Avon Skin So Soft is the ticket, not doubts in my mind, works great. Don't knock it till you try it.