I am a newbie and interested in making my own strop. I have a piece of skirting leather (basically a piece of heavy belt leather) that is rough on one side and smooth on the other.

I have never seen a store bought strop up close. So my questions are:

Is it ok to use this?

What side would I apply the paste?

I know I could by a strop for a reasonable price but I really like to make my own stuff when possible.

Any suggestions will be appreciated.