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Can I put squirt foam in an electrical outlet box on a dock? I need a good way to seal it up.
 

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Aspiring professional pot-stirrer.
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I'd put that firmly in the bad idea category; foam will hold moisture. I've seen people do that, and the outlet turns into a smoking black mess.
 

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Don't do it. Get a good outside outlet box.
 

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Buy a weatherproof box, the only thing that foam is good for is ruining clothes and making a mess. If you are in a salty area use a non-metallic box and conduit, the box should come with a gasket.
 

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Agree with the others. Weatherproof boxes work well for keeping out ambient moisture, salt, etc. But by no means is it submersible. Being under water is a whole 'nother ball game compared with being splashed with water!
 
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