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Expedition Leader
I understood just fine, I just think you would need a lot more insulation than you could paint on. The aluminum easily transfers heat in/out."exterior" ... as in "Exterior surfaces" AKA- parts not inside the window frame that would conflict with it's ability to open and close or slide. This would include "exterior surface of window frame" that lies in the Interior of the camper.
Sorry for my bad choice of words.
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