Photos below show  a typical job we run into more often than not.  

Roughly 6 months after this cushion was serviced by a major leather provider  this cushion was peeling, cracking and the color did not come close. 
Once this mess was removed we discovered only a few blemishes that required minor touch up    
 

Just because someone takes a three or four day leather refinishing class at a major leather manufacturer does not make them experts. It takes many years of training combined with the proper products.

Please !!!! Do your self a favor and have only very experienced leather craftsmen service your leather items and use caution using do all aircraft detailing companies.