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Back in the '70s I ruined the finish on a new Les Paul by using a plastic guard that went over the back to protect the finish. Oh the irony. (It had a foam strip around the guard to hold it in place. The foam melted onto and into the finish.)
I've been pretty paranoid about that kinda thing ever since. If I used a cotton or felt cover for the hanger, I'd make sure it was white or undyed. I'd worry about any dye leaching into the finish or reacting, especially on hot or humid days.
Also, if you hang the guitar on the wall, make sure it isn't a poorly insulated wall that gets a lot of heat. My wife used to have an apartment with one interior wall that got so hot during the summer you literally could not touch your hand to it for more than 3-4 seconds. But a couple of feet away you wouldn't have known about the heat problem, just that the room was warm near there. I could see someone hanging a guitar in winter thinking it was fine, and wondering why their guitar neck warped over the summer.
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