French Manicure with Flower Accent Nail Design.
The hardness of that layer is achieved with a polymer in the form of powder and a monomer in a liquid form. Combined, these substances harden only when they react with oxygen.
Image via Easy Nail Designs for Short Nails Step by Step feather. Image via Easy Nail Designs for Beginners. Image via Simple Nail Art Pink base, blue line. Image via Simp