Cutex® All-in-One Strengthener can be used as a base coat, top coat and strength treatment to add a layer of protection to your nails and manicure that leaves them feeling stronger. When used as a base, the multitasking formula smoothes nails, primes them for polish and helps prevent staining. As a top coat, it creates a hard, shiny and chip-resistant shield that helps prevent nails from peeling.