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I would consider cedar for a number of reasons...allowing for plenty of ventilation...
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Epifanes is an excellent marine varnish and I have used it a lot. But, it's expensive, you need lots of coats (7), it wears over time, and I don't think it will change the character of the wood - it just covers the wood with a film of varnish. Most of the boxes I see are either plastic or teak and I think there's a good reason for that. But, I assume you've decided against those.
Since the sides are vertical, I think that's the easy part, but would use something that you would consider using to side a house or shed with. For finish, I would use whatever you would use if it really was siding.
The lid is what has me wondering. I would think that a slight slope might help shed water, but can't imagine that any horizontal plywood surface is going to last long, regardless of what you coat it with. I would think boat deck when deciding on how to build the top. Cedar roof shakes would work, but wouldn't that be too heavy? Maybe T&G cedar with a frame?
Good luck. Please post pictures when you have it figured out.
Steve
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put them inside outside storage is a problem even in a covered box
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Buy a Rubbermaid instead. Cheaper & a lot quicker overall.
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I used two Rubbermaid bins but my wife has rejected them. She was unable to close it up properly (sometimes) and the elements got in. Little furry critters loved them and left evidence all over everything. That would me to suggest that whatever you do to be sure and seal the bottom portion tightly.
Thanks, Curt
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"Life can only be understood backwards; but it must be lived forwards."
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