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 of your chosen Envy to your bare nail. 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! £12.37 per 10ML