@Mocivnik Moved your post to Dyes, Antiques, Stains, Glues, Waxes, Finishes and Conditioners.
And to comment on NFO, it is a conditioner used to replace natural oils lost due to dyes and other treatments. It is not a finish. Also finishes (acrylic or lacquer) seal the surface of the leather. It helps prevent loss of natural oils, fats, etc. and blocks addition of oils, liquids, and other stuff that may damage the permanently degrade the appearance of the leather. It can wear off if the article is subject any type of abrasion over time. So a wax is often used to protect the finish and is normally buffed to remove any excess.