I have two Latigo strops. Both are 3 inch leather strops from SRD. The first one I bought with the back strop being matched webbing, the second one I bought with the back strop being premium fabric. Both front strops are leather with the backs being some kind of fine almost sand paper material. I also bought the chromium oxide spray. I watched a YouTube video and it showed that spray being used on the back strop. My questions are
1. What is the difference between the mesh, and the premium fabric
2. What is the back of the leather strop(the sand paper material) used for and when and how do I use it?
3. Should I ever use the back of the leather strop(the sand paper material) for refreshing the blade?

Thanks