OPI's Natural Nail Strengthener delivers stronger nails and acts as a protective barrier between your natural nail and colour to prevent discolouration. This product works as a great base for long-lasting manicures, this nail strengthener builds in layers to protect the natural nail and adds strength to brittle or fragile nails. Product is classified as a hazardous substance, highly flammable liquid and vapour. If product is swallowed, may cause nausea, vomiting and/or diarrhoea and central nervous system depression. Irritating to the eyes. May be irritating to skin in some sensitive individuals. vapours of this product may be slightly irritating to the nose, throat and other tissues of the respiratory system. Directions Apply 2 coats before colour as a base coat, or 2 coats on bare nails followed by an additional coat daily as a strengthener.