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Old 08-25-2013, 02:54 PM   #1
Meathead's Avatar
Join Date: Apr 2013
Location: CA
Posts: 33
Proper repair of underbelly membrane?

I recently had a blowout that resulted in a tread separation and subsequent damage to the membrane (plastic cover) behind the wheel opening. I see this opening as a potential access point for critters and want to patch the rather large hole.

What methods have members used for a durable pest/weather-proof seal?


2006 GMC Sierra 3500, CCLB
2005 JayFlight 25RKS
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Old 09-16-2013, 05:27 PM   #2
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Join Date: Jan 2013
Posts: 18
I have always used expandable spray foam to seal the underbelly openings. Once hardened, I will spray paint in black to blend in. When I've had to make an opening, I would pierce a small hole on both sides of the cut and plastic zip tie to close and then reseal with the foam.

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Old 09-16-2013, 09:50 PM   #3
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Join Date: May 2012
Location: Minnesota
Posts: 4,112
I do not recommend using spray foam. Spray foam will absorb and hold water, which in turns can cause mold and rot issues.

Can you post a few pictures of the damaged area?
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Old 09-22-2013, 10:52 AM   #4
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Join Date: Feb 2012
Location: Myrtle Beach, SC
Posts: 1,261
On the spray foam it really depends if its a open or closed cell type. Whatever you use I'd spray on undercoating after the repairs.
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