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Looked up "sealant definition" and the first result was this "material used for sealing something so as to make it airtight or watertight.". I would think that mineral oil and ren-wax might better...

Yea, I understand that. I do not disbelieve you.

If whatever material, be it ivory, horn or any other, whose cells can and do take in or release moisture be sealed with a non permeable barrier...

Yea, that is a problem with horn as it tends to gain or loose moisture like ivory, hygroscopic effect, and changes shape because of it. If horn can be sealed so that it can neither gain nor loose...

Interesting thoughts on stabilizing horn scale moisture content. Has anyone tried sealing both sides of a non warped horn scale with crazy glue to see if remains straight from being sealed?

Bob