I have two Herold Solingen loom strops, one is Juchten (Russian?) and the other is Rindleder (Cowhide?) and I want to apply pastes to one of them. They both have nearly identical textures, with the Juchten being minutely slicker and the Rindleder having a mintely more draw on my finger tips. I have a tub of CrOx (0.5 micron) and a tub of FeOx (0.1 micron), which strop would be better to paste and which one would be better to keep plain/unpasted to use for final stropping?