Ok so this might sound like off topic but its relevant!

So on my dad's 300SD I've got some water leaks coming from the battery compartment area. Ive not looked into it but the water is clearly coming down from that area, going into the passenger cabin due to some poorly sealed welds on metal I installed..tricking down the frame horn thing and out a small hole.

I need to fix this and I was thinking. I'll take the battery out and use some brushable seam sealer. Then I was thinking hmm maybe I'll get some of that fiberglass repair stuff and just form it over the entire area..

Then I was thinking of that one thread about polyurethane filling motor mount to give them extra support and thought well why dont we just do that? Pour some kind of expanding liquid down there. Let it expand, seal up the holes and keep water from coming in/out?

Only problem is I don't know of such a thing. It would need to be flexible after expanded and water/weather proof!

Anyway, what do you guys think? Think its a decent idea? Bad? Does such a compound exist?

Seems like something I'd expect to see in the marine world...

Hm?
http://www.uscomposites.com/foam.html

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