Shoe Goo works great. I had a bit of the separation of the top of the leather from the sole in the big toe of my Trek LS. It took me about 30 minutes to get it applied the way I felt was proper. I used a small toothpick to slowly push bits of the Shoe Goo into the separation. Then I stuck a piece of paper inside the toe so it put pressure on the leather against the sole and left it over night. I have not had any separation issue since. You would never know I did it. Take your time though because it is gooey and you don't want to look sloppy
