Sally Hansen Hard as Nails® Natural Tint, Nail Strengthener, 0.45 fl oz. For when you want your nails to grow stronger and longer, Sally Hansen’s Hard as Nails® is here to help. With a unique blend of film-formers for perfect shatterproof protection from chipping or cracking. This clear nail strengthener is specially formulated for strengthening weak, brittle nails. Ideal for quick fixes everywhere you go!