Acting as a protective barrier for your nails, the essie Nail Care Hard To Resist Nail Strengthener helps to improve nail strength and resistance against breaking, splitting and peeling. Created with nail bonding technology, the nail hardener works to fortify weakened nail surfaces to improve the appearance of fragile, brittle nails. A purple tint helps to neutralise yellow undertones. Apply to clean, bare nails to promote stronger, healthier-looking results.