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In response to Nichters concern about holding water and causing mold and rot, most of the oepn cell foams are hydophobic. I have experienced the soy based foams not drying out and turning into a type of pea soup consistency when it gets wet, but that was about 5 years ago.
There are some applications that open cell should not be used in, namely in crawl space conditions where there could be mositure migration from the ground.