Hardens the nail plate using Keratin fibres, allowing the three principal nail layers to bond together. Hardens soft nails and prevents them from breaking or splitting. Apply from the center of the nail to the tip only. Avoid touching cuticles and skin around the nails in order not to harden them as well. Leave on for one minute to penetrate and then apply the BARRIER BASE COAT, Polish and Top Coat. $23.00