Gel stay strong system The OPI GelColor line features a system that provides extra strength and durability. With added gel, the formula has more staying power and a thicker viscosity for increased strength. It is infused with calcium and a vitamin complex that leaves nails feeling strengthened during gel use. Excellent efficiency and value Enjoy the ability to perform approximately 80 sets per bottle. With a 30 second cure time between coats, they are quick and easy to apply for flawless manicures and pedicures. They can be cured under both LED and UV lamps and can last up to 3 weeks.