I would figure a sign hanging up on a wall for 75 years shouldn't really experience too much damage
You'd think so, but they weren't made to last. Paint fades and chips, sun rays bash electrons off the paint, and if it's electrical there's all sorts of other complications. They weren't built to be heirlooms. They were built to temporarily advertise a product. Even outdoor signs are meant to be replaced after a decade or two.
I would think outdoor signs get replaced more often than every decade or two
I don't actually know how long it takes. I suspect it matters where the sign is (geographically) and what the sign is made of.
There are still people who make a living making and repairing signs. Curiously, in just my small area, I know two of 'em. I have never asked about replacement frequencies.
I do know that the outdoor signs of a local Subway and several Dunkin Donuts locations have (probably) not been replaced in at least a decade. Internal signage is changed all the time. The electronic signage has been changed a few times. I think the franchise makes us do that. The outdoor signage for the drive-thru has been changed at the Dunkin locations that have a drive-thru.
I figured that fading from the aging due to suns rays would be the most damage
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