Empire23 came up with a simple method to weatherproof camera lenses. It is designed not only to prevent water from getting into your precious camera lenses but also other nasty stuff like dust, dirt and sand. If you are the kind to slug your equipment through snow, hail and dust storms, then his home-made method might really help protect protect your lenses!
Weatherproofing camera lenses is, as far as we know, NOT an official use of DuPont Krytox. Neither is such a method sanctioned by major camera lens manufacturers like Nikon, Canon, Tamron or Tokina. Therefore, using Krytox to lubricate and weatherproof your camera lens could void its warranty or damage it. Therefore, please do NOT attempt this weatherproofing method unless you completely understand and accept the risks.