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Herb,
That looks like the foam I have. When we removed that lead soundproofing and found corrosion, we cleaned up the surface with Scotchbrite, did an acid etch and Alodyne, then applied a coat of Zinc Chromate primer. That was the recommendation of my mechanic, and he suggested we remove all that stuff in the belly of the plane as well.
The foam was cut to match the location it was placed very meticulously, it must have taken a few hours to get all the inside walls and ceiling of the cabin covered. I am glad the plane came to me that way!!
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