Sally Hansen's hardener is an excellent choice for those looking to strengthen their nails. Designed to be applied on the nails, Moisture Rehab Nail Care helps support their strength, making them harder and less prone to breaking. It is ideal for weak and brittle nails, offering preventive care for damaged nails. For best results, it is recommended to be applied on bare nails, as otherwise the effectiveness of the product may be reduced. Additionally, it is suitable for caring for cuticles.