Is expanding foam waterproof?

Old 12-18-02, 01:28 PM
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Is expanding foam waterproof?

I was looking at some "Great Stuff" expanding foam at Lowes. It says on the can that it "provides a permanent air and waterproof bond". It recommends painting exposed surfaces. So, if I paint it, will it keep water out?
Old 12-19-02, 07:12 AM
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I've never used that brand, but all of the expanding foam I've used is not really water proof.... it kind of gets soggy after a while.

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