As someone who understands something about making leather from the skins of animals, I primarily use NFO and sometimes tallow (venison, the same as i use in my soap) on my very old strop. I have a jar of "strop dressing" but it appears to be nothing special-something like sno-seal.

NFO is handy for the strop, oiling the blades, and lubricating patches for my rifle. get the 100%.