The nail polish pen is one of the most practical inventions for those who want to achieve the perfect manicure, whether it is classic nail polish, French manicure or even nail art. Find out how to use this accessory, what are its pros and cons, and where to find the best varnish pen. Varnish pen: what is it for? The varnish pen or nail art pen is a pen that allows you to apply your varnish by tracing more or less precise patterns: flowers, arabesques, geometric shapes … THIS PEN CONTAINS NAIL POLISH AND MUST BE APPLIED TO A SMOOTH…