Mineral Nail Hardener is a professional nail mineral conditioner designed to strenghten and condition your nails. Shake well the buttle before use! Do not apply nail polish during the first week. Apply the hardener morning and evening a thin layer of Mineral Satara Nail Hardener every day. The next day remove with a nail polish remover and apply again in morning and in the evening. Repeat the treatment during the second and third week every 2 days.