Re: damn glasses fogging up???
No applied solution, IMO, actually works well. I tried cat crap and practically every other suggested brand out there. Nada. The trick is in getting different shaped glasses.
Essentially what happens in hot weather is really bad fogging and sweat where the top frame of the glasses meets your forehead, *especially* when shooting prone. No amount of anti fog spray, coatings, or vents really help this (believe me, I've tried.) I've seen others with normal shaped sunglasses or shooting glasses frequently have this problem too.
You may wanna look at the "high bridge" style like Decots, which is what I finally went with for all my shooting (from indoor pistol to outdoor prone and highpower).
They are built to remedy exactly this problem. They have a physical bridge between the top frame and your forehead, giving ample clearance, and also have an elevation-adjustable nosepiece to raise the glass center higher on your head. Will you win the "Most Xtreme Tactical Motherfucker!" award? Probably not. But they did solve my problem and are very clear.
Good luck!