Why doesn someone invent nail polish in a pen?
Yes you can get nail polish in a pen, and certainly it is easier to avoid any overlap onto the skin surrounding the nail … however, I do think a brush gives a better, smoother finish. You can also get nail polish remover in a pen, and THAT is an absolutely wonderful product which makes touch-ups so much easier. If you use the remover pen, you will find you don’t have to worry so much when you’re applying your regular brush on nail polish. You’ll get the lovely finish, and no mess.