After a 40 year hiatus, I have returned to real shaving. My new SRD strop has a felt backing on the leather in addition to a two sided webbing strop. This is quite different from the leather and linen strop from yesteryear. My question is, which material is preferable for pre leather stropping and which is better for pastes and sprays. Does the untreated webbing do a better job of pre leather blade prep or would the unpasted felt do a better job? Thanks so much for your time and efforts