Instant help for severely damaged nails! This therapy forms a ceramic Nano-shield to instantly improve nail condition. It serves as a base coat with improved adhesion. When used as a top coat, Nano Shark hardens your nails over the nail polish. It contains formaldehyde to reinforce nails. Immediate results are guaranteed! Top efficiency nail hardener. An instant help for damaged and weak nails. It can be used also as a base coat and top coat. Apply twice a week to promote strong healthy nails.