The Xtreme Rage stuff does work when it rains. (and far better than some of the other stuff I've tried) The only problem is that it only works for about 20 minutes before you have to re-apply. Getting some goggles that are anti-fog from the get-go as the original post suggests is one of a few ways around this. Now if someone could suggest a way to make a scope anti-fog I'm all ears.

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"Two Wongs do not make a Right"
XT Team - Task Force Wong; Tai-i Wong
-TFW Springer Weapon Assault Team (S.W.A.T.)