A formula designed specifically for soft and thin nails by fortifying nails with extra calcium and sea minerals.::::Strength is beauty and OPI delivers strength with its range of Nail Envy natural nail strengtheners. OPI has developed a different formula to meet your individual needs. Application is simple. Apply two coats to your bare nail and then apply one coat every other day to maintain your treatment. You can also use Nail Envy over lacquer so there are no excuses for not getting nails to envy.