This has nothing to do with the initial question, but I have wondered what to do about a stain on the ceiling of the bathroom, near an outside wall. I'm not sure if it's from the humidity of the bathroom (which is small and has no fan) or if it's something caused from the eaves or whatever. I have painted it with BIN primer/sealer, and noticed that it "moved" down the ceiling past the spot where I sealed it. What could this mean?
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