It might have been the material of my shoes, but this didn't work for me. I sprayed 1 layer and left it on for an hour and then sprayed another layer to let it dry overnight. I put a little water to see if it worked and it completely went through. Not only that, it also attracts dirt like crazy. Doesn't help that my shoes are white either. I'm going to try this on another pair to see if it works and then update.