Exactly what it says on the title really. I had my toenail removed a few years back because it was bastarding agony (ingrown) and I only ever miss the damn thing in summer when it's strappy shoes time. I paint a nail-shaped patch with polish and it looks OK at first but the ones I've got go wonky and peel really soon after applying.
So I need a really flexible and strong nail varnish. Colour not really important!