Leather or finish issue.

[Nerdbuilds]

Hey all, I’m a novice who’s getting back into crafting now that for the first time ever I have a dedicated workshop. I’m working on a breast plate that I cut from leather I’ve actually had for a couple years. It’s dyed with water stain and finished with Fiebing’s leather sheen and today I noticed that the part that bends around my sides has tiny, discolored cracks or wrinkles. I’m wondering, is the leather too old, did I put on too much sheen, can this be fixed?

[Tugadude]

Since there's no picture, I can only speculate but it might be too much finish.  It should be easy to tell if the cracks are in the finish or in the leather itself.  Bend the flat part and see what happens.