French Photo Hardening Gel with high viscosity and a milky white color (soft) essential to cover the free corner of the nail during Nail Reconstruction phases. After applying the Primer, apply directly to the Natural Nail or Tip a useful layer to have a uniform and opaque color, then expose it for 2 minutes to UV light in a 36 Watt Lamp. It must NOT be degreased. Then proceed with the application of the UV Builder Gel and the subsequent UV Sealing Gel. Polymerization Time: 36 Watt UV Lamp 2 Min/ Led 90 Sec Product Density: VERY HIGH