I ordered this to get my Ecco Biom Hybrid 2 golf shoes' midsoles back to white after they had yellowed.  I did 4 coats each time between 3-6 hours each, using plastic wrap (just as directions stated).  No real noticeable changes to the color.  On top of that, by the 4th coat I was getting sloppy with it, and where it got onto the leather it started to eat away at the leather finish a bit, further hurting the look of the shoe.