This base coat is a double action layer that protects the surface of the nail and improves the adherence of nail color. It is infused with polyvinyl, which creates a tough, flexible layer that causes the polish to adhere to your nail. It contains a UV absorber, protecting the nail plate from yellowing, staining and discoloration. This product is 5-free: free of the top 5 toxic chemicals. How to use: Apply one coat to clean, bare nails followed by two coats of desired nail color and one coat of Glamour Fix 2n1 top coat to complete your look.