5 EASY MINUTES. Eliminates grays for a thicker fuller look. More guys trust their facial hair to Just For Men® Mustache & Beard because our beard dye is specially designed for coarse facial hair. In 5 minutes gray is gone. As a bonus facial hair feels softer and more manageable. Made with biotin aloe and coconut oil. Can t decide between two shades? Try the lighter one first. You can always go darker later. .