Nail Building Repair Base Varnish unites a base coat and nail treatment in a single product. The base strengthens the nails, makes them look healthier and ensures the natural growth of the nails. According to an external study, the base varnish ensures nails 84% more strengthened and resistant and 86% less brittle, as well as more beautiful nails. * Self-assessment of 50 women who have applied varnish on their natural nails twice a week for 3 weeks. Vegan.