Soldier,

abrasive pastes very much respond differently when using different platforms. In a kind post from Glen, (I hope I'm remembering correctly) felt, linen, leather, balsa. The order of those is in increasing likelihood of producing a harsh finish. I've used crox on leather. Its okay, has helped w/ some cranky blades. I've also used slurry from a C12k and a Nakayama asagi on balsa - not bad. More recently, tried linde 'A' (.3m alox) on leather. 'Good, but not as good as CBN on most anything.