Nail Strengthener and Growth Nail Ridge Filler - Can repair damaged nails, including weak, soft, brittle or cracked nails, prevents cracks and repairs nails. Can also be used as a gel polish or base coat. Gelike ec Nail Hardener: Made with a natural organic formula, mainly composed of keratin and jojoba oil, which provides nutrients to the nails. Gelike ec Easy to use nail hardener, covers and protects nails, strengthens weak nails, soft brush design, easy to apply, not easy to smudge. Gelike ec Nail hardener No UV light required - naturally air dry. Apply 2-3 layers and wait 2-3 minutes between each layer, saving time. Please do a skin test before use, if you feel unwell, stop applying immediately. If you have any questions, please feel free to contact us by email.