Using the gel eyeliner is tricky (it still is to us) until we found this very useful tutorial. Applying the gel eyeliner can be unnecessarily complicated and could be tacky if not well applied, now ...

Whether you are filling in your brows, using this as an eyeliner, wearing it as a lip stain, or drawing on some freckles, the steps are the same. Apply the product. Leave it on for about 20 minutes.

Then use small strokes to fill your brows' sparser areas, following the direction of the hairs. (The product that was used for the show: Bobbi Brown Long-Wear Gel Eyeliner in "Sepia Ink".) To finish, ...