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As you can see it used to have some plastic covering. The frame is held together with (sorta brittle) plastic pins but my main focus is how I'd re-cover the frame in plastic:
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What sort of adhesives should I consider for outdoor metal-plastic bonding?
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Is adhesive and soft (clear) plastic even a good idea?
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Have any of you done something similar?
Yeah that's what makes it confusing. Shortening mm to "mil" is pretty standard when dealing in metric. But will be orders of magnitude off if it's in imperial measurements.