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I use the .50 Diamond spray on my wool felt strop. I spray one light coat, about 6-8 inches away, and let it dry overnight, then repeat the next day. I'm sure it's the same for the Crox spray. I...

Pretty much everyone uses .50 diamond on Wool Felt, It excels with that, or the Crox.
Both are excellent choices for the wool felt.
Not sure I understand your question about the grain. We usually...