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I've been told that many times before. My issue is oil is messy. I don't find i got anything out of it. but if someone feels that's their ticket don't let me stop you.

Glycerin imo works as well. And water soluble. I know a few guys personally who have used oil on their cotis with no I'll effects. But oil is messy. I don't use any oil stones. I don't have a reason...