CND Shellac Base Coat, Top Coat & Color Combo. Get everything you need for a complete gel manicure. With Shellac's professioinal high quality endurance gel designed to shine for up to two weeks. Requires a UV light for curing.CND Shellac Base Coat, Top Coat & Color Combo. Get everything you need for a complete gel manicure. With Shellac's professioinal high quality endurance gel designed to shine for up to two weeks. Requires a UV light for curing.