Just focus the stuff

I use to sharpen a 1000/6000 Wasserstein and after pulling the knife on the leather plus paste, you get the knife to the scalpel or razor sharpness depending on diameter and quality steel grade.
Have treated before thinly the paste even with leather oil leather. Then the leather remains supple and beautiful gets later no cracks, also the paste does not penetrate too deeply into the leather one. "Pull" After that one day leave and work the paste with an old knife into the leather.

See Leo's messer-machen.de website.

Since there are great tutorials about the topic "sharpen knives" to see. Also what this product specifically relates.

From me 5 stars for this class polishing.

To beat price-performance hardly