I dont know if the King Ranch F250 is only in texas, hopefully not so you know what I'm talking about. I used Z9 & Z10 today on the Ford and when I put the Z9 down it was fine until a real dirty part. It turned it a dark color and then a little(leather color) would come off in the applicator. Is that right? Can you not use zaino on that type of leather? Little help please.