I have never owned an old gun with a pad that wasn't coated with something! That's probably not a good excuse but that's the best I can come up with!
When you get them, they have a sheen to them. But after they are shaved to fit the unshaven part retains the sheen and the rest is dull. So coated them with something gives them a uniform appearance? Preserves them? I don't know but have to figure something out.
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