Join Date: Jun 2006
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It is quite possible merely to dehumidify a tool locker using dessicants like silica gel or kitty litter and keeping the air moving with a tiny fan. Another tactic is to bag tools in sealable freezer bags with dessicant...just remember to dry out the dessicant bags on a sunny deck. Of course, a thin coating of oil does wonders, and if you have the space, you can even keep them in the fridge, which has typically drier air than the surrounding boat.
Lastly, make sure the boat itself is properly vented...a fairly large topic in and of itself, but less moisture doesn't only mean less rust, but less mildew and mold.