This is an open cell foam and water reservoir. Instead I would use a closed cell foam product. SoundSkins has a closed cell version and I think Stinger has it now too. The idea is good, only open-cell foam won't do you any good. They hold water (and therefore mold) and the sound travels straight through them into the door chamber. Closed-cell foam won't hold water (and mold) or let noise in through your doors.
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