Flexi: Extremely flexible and pinchable gel polish. Correction and/or extension needed for the natural nail? With Flexi Builder Base gel polish you can complete the broken nail corner or extend the natural nail even 3-5 mm long on a nail form. Provides thicker base ensuring more durable wear. Thick viscosity enables to create nice C curve (arch) and also levels the surface of the natural nail which grants much nicer base for any coloured gel polish applied on the top.