I never tried those nail polish pens just because I was convinced they wouldn't work. I had no proof to this, but I just felt like it was "too easy" of an application. There's no way it would stay on my fingernails and last. I had even seen reviews online where the product was slammed...
Well, I was wrong.
For Christmas I was given two Sally Hansen Color Quick Chrome Nail Pens. I tested them out and I really liked them. I was given the fuchsia chrome and a purple chrome.
Now -- it's not PERFECT. The formula is kinda liquid-y and sometimes it comes out too much on your nails. But, with a little touching up and some glitter top coat... I didn't have to change my polish for nearly a whole week. That's something unusual for me.
And, bonus, I can touch up my nails at work and not look that suspicious! ;)