When it comes to pastes my favourite is cerium oxide but it is hard to find. They use the very pure stuff for polishing glass lenses, so if you can find someone that does this sort of thing. There is a lot of it out there for lapidary, but it is nor really the right stuff. I have some I got a very long time ago that is .5 micron and is quite nice. Other than the late Neil Miller, I have not seen it for sale in any strop/roazor shop. If you are looking for a mission, it’s a good one but the CrOx mentioned above is pretty good and easy to find. Most razor shops have it as well as FeOx which I have never used but some people are over the moon about it.