I'm not much of a Nail person, so on the rare occasion that I do use Nail Polish, I want it to last. To see which top Coat gives the most bang for your buck, I tested five different brands--on one hand.
I used a different top coat on each of the fingers on my left hand. My right hand was also painted, but left free of top coat, for reference. I did not reapply the top coat after the day one polish job--so these results show the full lasting power with a single application.