It's generally recommended to NOT use saddle soap on finished calfskin......it is far too alkaline. Besides, technology has rendered traditional saddle soap almost useless even in the tack business. There are far better options with a much higher glycerin content. Saddle soap has history on it's side, but most pro's avoid it.......and most brands have turned to a formula that is mostly rendered pig fat now. Anyway, the ph of saddle soap is usually around 9-10, and that is far too high for any productive results. Actually, when you use products that are that far off on the ph scale from the leather tanned for footwear (ph usually around 4-5, or acidic) it has a degrading effect over time. Besides, ignoring all of that, there is a reason we all put horses on the tins - saddle soap is for tack, not shoes.