I don't see a non-leather side in your photo. Personally I use a diamond pasted balsa strop for daily edge maintenance. In my vintage hanging strops, red paste was mainly applied to the linen components, but sometimes applied to prepared surfaces on the back side of the leather component.Yay, my first strop!
Store made a mistake and sent out two, I'm not complaining.
Now to try and wait until my first SR arrives...
PS do I need to use red abrasive paste on the non leather side?
They forgot to deliver that.
View attachment 1575411
Here is the back surface of one of my vintage strops:
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