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Instead of trying to stop the wood from getting wet, I'd take a differeent approach. 1. Use materials that can handle the water. No matter how much you paint the outside, the inside will still get wet by the moisture in the ground "sweatting" on the inside. The paint will stop you from rotting from the outside, but you'll still rot from the inside. Marine plywood would be the best, but pricey. If all you can afford is exterior plywood, I'd for sure paint it inside and out as you build it. I'd also add a small vent in your structure to help keep the inside dry. 2. I'd work on keeping the base of the structure dry. I'd do it by putting it on a good base (+6") of gravel and making sure there's plenty of drainage in the area so water doesn't puddle. Mark in Utah (grew up in Washington)
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