Start your flawless gel manicure with OPI GelColor Base Coat. This classic formula creates a durable foundation for gel polishes and a final topcoat. GelColor Base Coat is your essential first step in creating a gorgeous nail look that lasts for weeks, regardless of whether your nails are healthy, hard or brittle. The key to a successful gel manicure is bonding – and GelColor Base Coat is critical to the process. This lightweight long-wear coat goes on first, working with your gel nail color to provide three weeks of true stay-put color with a beautiful finish. Your GelColor Base Coat and polish soak off for easy removal when you are ready to change your nail look.