I have a child suffering from Trichotillomania and will say that this stuff has been a life saver.  We are able to avoid the need of a wig thanks to this product.  I'm not saying it is a perfect product because it can be scratched off or easily removed by water so it isn't an option for swimming, but I'm thrilled with it because my child is able to go to school without a wig which is very big deal for us.