I just read this entire thread and either I am "missing" something or I don't understand the initial problem - water in the boots. I am pretty sure that every overlap boot will leak if you don't tighten the lower buckles. So tighten the lower buckles and they should stop leaking - no? You seem to have done this and reduced the leakage in later posts.
They will leak because there is no "soft" gasketing material in the overlap other than across the front of the toe box. Overlap boots rely on hard plastic over hard plastic to "seal". If you don't apply pressure, by fastening the buckles, irregularities in the plastic surfaces will cause minute "gaps" that will allow water to penetrate. OTOH, It could be poor boot design of the overlapping flaps that may not seal properly or gap when flexed with the buckles open or not tightened sufficiently.
They will leak because there is no "soft" gasketing material in the overlap other than across the front of the toe box. Overlap boots rely on hard plastic over hard plastic to "seal". If you don't apply pressure, by fastening the buckles, irregularities in the plastic surfaces will cause minute "gaps" that will allow water to penetrate. OTOH, It could be poor boot design of the overlapping flaps that may not seal properly or gap when flexed with the buckles open or not tightened sufficiently.
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