The "Real stuff"Circa 1955~75, was Aluminum with an adhesive backing .. Or so I'm told
(I was in the Navy on a Boomer With ICBM's in my Bedroom)
One of my Friends Is an Aircraft Maintenance tech for the USCG . He said there was a lot of admiration in the training school faculty for Those Army and Marine people who got out the Tool Kit and Improvised fixes to get back to the base .
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