Strengthens weak, thin nails. Rebuild helps weak, thin, soft, or peeling nails. This unique protein formulation seals the layers of the nail together. Upon each application, Rebuild reinforces and thickens nails providing durability while promoting strength and flexibility. To Use: for optimum results apply one coat every day layering for 4 days, then remove and start again. Rebuild can also be used as base coat before nail polish application.