Double-exclamations aside, I'm just pointing out that you can't claim to know the ingredients of any and all cordovan creams on the market, and therefore cannot say with any certainty that they're all safe for calfskin.
I think with how inexpensive shoe polish designed for calfskin is, we should be suggesting he use the right tool for the job rather than risk any damage.
cordovan cremes by their definition have to be more gentle than cremes for calf skin!! less solvents -more oils so not to damage the smooth surface of cordovan( thats why when you use cremes for calfskin on cordovan you make it dull, you take out some of the wax infused in cordovan at tanning-making progress)
This seems like an oversimplification. Saphir cordovan creme has a neatsfoot oil base while my understanding is that the shoe polish has a shea butter (or something similar) as its base. Similarly, the cordovan creme has no turpentine wjhile the polish has turpentine to assist in penetrating into the calfskin.
turpentine is a solvent(like naptha etc) !! its perpose in wax-creme polish is to prevent solidification of the product so you can use it!! turpentine's work has nothing to do with penetration!!! btw waxes of any kind of polish stay on top of the leather they dont penetrate in it!! there are other ingedients thats penetrating in(like oils etc) so to make leather supple and prevent drying
i really like Glenjays polish too and consider some guys here like you as friends of mine(hope one day we can all meet in persone) but pls dont right things that dont stund!! we have discused it here a lot with glenjay -chogal and you (if i remember correctly)!!
RENOVATEUR has no turpentine in it, it is water based( no smell of turpentine and nowhere is mentioned that it has in it)!
the cracking i have seen it too on my shoes and it has nothing to do with the conditioning properties of the product!! this micro cracks are from the bees wax that is in renovateur that stays on top of the leather and rase a shine if you buff!!wax is what is cracking and because there is no pigment(color) is visible!! the same efect but more visible is if you use neutral wax on dark brown shoes!!