I really doubt you need to recolor the bag. You just aren't using the right products. Coach lotion isn't the right conditioner for rehabs. Try Leather CPR, several coats a day apart, buffing after they soak in. Then Blackrock Leather n Rich for the final coat or two. At the most, you'll have to touch up the corners, which you can do with Leather Refinisher mixed with Coach conditioner. You don't need the leather finish preparer, and I strongly advise against trying to recolor an entire bag. The Leather refinisher doesn't have the same texture as real leather. It is acrylic and if put on too thick, it is bad for the leather and looks bad.
Where can I buy the Leather CPR?