That expandable foam attracts and holds water worse than Bondo. Ive seen it used in a few cars, and when water gets in there it just sits, and the body part rusts out from the inside.

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1984 300TD

I stopped and looked at an RV last year and noticed that the factory had used that expandable foam alot underneath the rig and then they use undercoating to seal its fate! Talk about a rust sandwich! Then the owner came out, I paid blah blah blah for this 12 years ago. Whatever, see ya. What a POS.

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Currently driving a very clean 1985 300SD from the West Coast.