This is a video of what a handgun looks like after you take it swimming with you. I double ziplock bagged it but water still got in. I will have to find some kind of diving dry bag.
http://www.youtube.com/watch?v=-BNalYE9bzc
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That stinks. I’ve had similar experiences trying to waterproof things with sandwich bags. Fortunately, I never tried to waterproof a handgun with them.