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Most foams build a water resistant skin, some outgas various compounds during cure which can lead to corrosion (different than rust, but same effect). The msds published online tell what to expect and are available before you purchase.
I would use a waterproof primer of some sort both for waterproofness and adhesion
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casual notes from the underground:There are some "experts" out there that in reality don't have a clue as to what they are doing.
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