Our real Micro-Diamond and Titanium formula instantly bonds to your nails, strengthening while virtually ending breaking, peeling and tearing. When nails need a boost, Sally Hansen Diamond Strength Nail Hardener shields them ? leaving them noticeably harder and stronger. Apply 1 coat to bare nails. Use alone or as a base coat. With Diamond Strength Nail Hardener, diamonds are your nails’ best friend! Step into your always-on salon. No menu. No rules. Sally Hansen puts the power of self-made beauty in your hands, with on-trend colors.