A few weeks ago I decided to grow my nails after years of biting them 
After a while they grew long enough to paint so off I trotted to the shops to buy a few nail varnishes (Rimmel and L'Oreal).
Okay, so these aren't premium brands, but they were okay a few years ago (when I last grew my nails). Now, they're like bloody Tipex! They don't cover either, so you have to apply about six coats to cover the natural nail colour. They also chip after about three days 
What do you have to pay to get a reasonable varnish and which makes are any good? I like to change colour about twice a week, so don't need a long lasting one, just one that's easy to apply and covers properly.