Start finishing 3 in 1 basic treatment OPI, top coat and strengthening | Strengthen your nails with OPI Start to finish, a 3-in-1 coat, top coat and strengthener with a vegan formula infused with vitamins A and E. This nail strengthener covers all your bases in one bottle. Consider it a 3-in-1 wonder Base Coat: Protects against fading Top Coat: Provides long-lasting shine Strengthening: Helps protect nails from chipping, peeling and breakage when used daily Benefits: | Vegan formula free from original ingredients or derivatives animale. As a top coat, it provides long-lasting shine and color protection.