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Never said they were useless, just that the newer stuff isn't flat, smooth and lump free like they look on tv and a huge PITA to seal. Somebody built a roof from a 7x7 series airplane.
Mexico had some that ought to be scrap by now but I suspect they figured out how to delay obsolescence
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casual notes from the underground:There are some "experts" out there that in reality don't have a clue as to what they are doing.
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