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I was glad that someone asked this question & others had responded. I was thinking of using the foam, but wondered if it would be moisture free. Apparently it isn't. Thanks for not letting me make that mistake. psmith1951
My 51 cab was foamed down in the corners. My corners are rusted thru. I agree, moisture was the cause. Of course, the old girl did come from the upper Michigan and North Dakota before that.
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