I used it very successfully on one pair of shoes that were slightly tight.  It was amazing!  For two more pairs of shoes I had that were VERY tight, it took 2 or 3 applications, but even they loosened up to where they are very comfortable now.  I loaned it to two other people who loosened up 4 pairs of shoes, so in total this one bottle has "stretched" out 7 pairs of shoes, and the bottle is still 2/3 full!  I am so thrilled to be able to rescue these expensive shoes that I came very close to giving away.  I highly recommend.  Thanks!