For flies/sand flies in the UP in the Lake Superior area, I have had decent luck with an odd product I found at Walmart. It is 2-in-1 Bug Defense and Sunscreen Spray by Ozark Trail. (I also believe they have the bug defense alone, but being of Irish, German and Norwegian decent I need the sunscreen even on cloudy rain days practically.) It uses "natural" bug repellents. I could give a rats rump about that, but it smells strong but pleasant and keeps the flies at bay. Since you reapply ever 1.5 to 2 hours the effect doesn't seem to wear off. It goes on clean and doesn't mess up clothing. It does nothing for the mosquitoes up there, but it does hold the gnats off for a bit too. It is found in the Camping area of Wally World and runs about $7 a 5oz can.
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