I learned a trick many years ago - I put my sunscreen of choice on my face (and elsewhere too, of course!). To prevent the sunscreen from rolling into my eyes, I put some lip sunscreen - like Blistex Ultra Protection (SPF30), although I'm sure any of the lip stuff would work - on my eyebrows. That somehow provides a barrier that the sweat doesn't roll through. I know it sounds a bit strange - but try it, it really works!

--- Denise