I missed a beautiful sunset with broken storm clouds last night. I intended to photograph the Pole Branch at Franklin Parker Preserve, got about 1/4 mile from the main entrance, and retreated back to my car. Although my clothes all always treated with Permethrin, and I sprayed my long sleeve collared shirt with Picaridin, and hat and face completely with Picaridin, the flies were like airborne pirhana, in my glasses, ears, nose, etc. Tuesday morning, 40% DEET at Friendship seemed to work pretty well, but the flies at Franklin Parker at sunset were worse. The problem with DEET is it melts plastic, if I get it on my hands it will screw up my gear, my glasses, and anything else it touches. And it's a "safe" neurotoxin (uh, right). Ignoring the geek factor, I ordered a head net to hang over a camp hat. Lemon/Eucalyptus spray and Skinsations spray seem to be ineffective. Is a physical barrier the only real solution, other than DEET (assuming that would even work in extreme conditions)? Or do you guys just get bit and ignore it?