Review title is Great for covering up the gray or even those embarrassing ... [SEP] Great for covering up the gray or even those embarrassing bald spots. Don't go to bed or get caught in the rain with this product in. Your head will run like mascara onan '80s soap star. I would recommend you NOT leave product in your hair overnight, both you & your partner will wake up covered in black sut. Not to mention your clothing, bedding & parts of your body you'd never think it would reach.