If you've ever used leather dye - real leather dye - and expect this to act the same way, that is: to soak into and dye the leather, then you'll be disappointed like I was.  This is some kind of gooey surface coating similar to a sloppy paint, but it imparts almost no color at all to the leather.  You can take your fingernail the next day and easily scrape all of this garbage off the surface of your leather.  If you need leather dye, look elsewhere.