well the soy seal looks to be more of a weather seal kinda like thompsons for decks and stuff it would work to protect the wood from water rot and warping and such if you didnt plan on having water in it but in order to to an actual pond area it would require something like what i have or a false bottom setup in which case it would keep the water from rotting the wood but most likely wouldnt protect the water from leaking out of your joints
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