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Heh... Adam is right on the solution...
I hope I didn't come of too much like a know-it-all... But the thing is it had actually not occured to me to even ask the question... I just assumed that once the board was assembled and tested it was sprayed with a coating of urethane varnish to protect it from moisture... That's the basic step one... I do that to all circuits I ever build... Regardless of where they are going to be...
In your case if you do that and put it in a sealed box it's OK... If it sits in a exposed area like where it gets splashes I'd consider sealing it completely... But on the other hand that makes repair/modification hard...
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