Wish your hair color lasted just a little bit longer? The wait is over.Introducing Cover Your Gray's Waterproof Brush-In, a waterproof formula that lasts through 3 shampoos, is sweat-proof and rain proof. Waterproof Brush-In has a Mascara Wand Applicator ideal for covering wispy grays and/or longer strands of hair. Waterproof formula: lasts through 3 shampoos, is sweat proof and rain proof,Mascara Wand Applicator. Can be used on eyebrows No water needed, just open applicator and apply. Will not mat or clump.