To ensure more even application of nail varnish & longer-lasting wear. Beauty Benefits: Smoothes a ridged, uneven nail surface. Makes polish longer-lasting & more resilient to wear. Application: Apply to clean, dry nails. Wait a few minutes then apply nail polish. Forms a non-occlusive film on the nail surface which is also protective. Active Ingredients: Formalin & toluene-free, does not dry the nail.