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1. It, like everything else, adds weight. The gain is minimal compared to the return.
2. It's sticky and can get everywhere if you forgot to tape up a small hole. Ask me how I know.
3. It's nearly irreversible. Once it's in there, there's not much you can do about it. Maybe an acid dip will remove it, but I'm not sure.
I seriously doubt it will take in moisture. It provides a place for moisture to hide, but it is not absorbent, at least in my experience.
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