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Old 12-28-2012, 12:04 PM   #5
troidus
Beastly Adventurer
 
Joined: Sep 2010
Oddometer: 12,031
I still think spray foam is your best bet. It's self-supporting and rot-proof, as long as you keep UV light away. If you're going to weld in there, you might need a portable barrier around your project.
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