OPI - GelColor 0.5oz/15ml LED cures in 30 seconds. Amazing shine and protection . Weeks of glossy wear. Gelcolor by OPI is a Ultraviolet manicure system that allows your nails to stay healthy and strong. The OPI Gel Nail Polish is made to last the minimum of two weeks. Use with a UV nail light, OPI Soak Off Gel Base and OPI Soak Off Gel Sealer.