Hi guys,
The P100A2 did alright at the SHOT Show in a fish tank. Never seemed to get wet inside.
EagleTac says it's waterproof to 3 meters or about 15 feet. When someone asks me how waterproof they are I say "Feel comfortable using it all day in the rain and if you drop it in a puddle or even a small stream, no worries, but don't take it diving, it's not a dive light".
It's always a good idea to make sure your o-rings are wet with a good quality lube.
Notice the goldfish at the bottom?