In my opinion, any substance which is added to a finish that creates a hard texture is unhealthy for a gun's finish. This is the reason why I prefer a light universal grease which can be repeatedly wiped and replaced with the same thin layer of grease.
I once received a pistol which had a hard yellowish protective coating on the barrel (I believe a type of grease starting with the letters Lan... used during the wars) and I had to use Kroil (an excellent cleaning oil) to remove it! I recommend using a grease which can allow the surfaces to 'breath'. Furthermore, if anybody handles the pistol and applies a few finger prints on the metal, simply Rig it off and the new layer of light grease gives the same protection as any wax.
Just because a museum uses a product or a certain system for care does not mean that it is the ideal. Maybe renaissance wax is good for wood surfaces, but I would not use it on the metal of any gun in my collection.
Be wise,
Albert
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