NATURAL ALL IN 1 hardening base & top coat by CATRICE. Base, Top Coat, Nail Hardener and Natural Ingredients - All in 1 Hardener Base and Top Coat brings it all together in one bottle. Used as a base coat, it strengthens and hardens the nails, protects them from discoloration and smooths out any unevenness. Applied as a top coat, it gives nail polish a shiny finish, makes it more durable and prevents chipping. The Natural All in 1 hardening base and top coat contains 94% natural ingredients and is vegan, a true multipurpose.