I have Duraline and it’s an amazing product! It transforms any eyeshadow into an eyeliner. Just place a small drop onto the back of your hand, dip your eye lining brush into the liquid, and then drag the brush over your eyeshadow. You can also layer the product to make the liner more vibrant or darker. I had fun in the summer playing with bright and shimmery eyeliner! This process will leave a film on your eyeshadow, so I do suggest that you scrape a little powder off the top of the shadow and pick it up with the wet brush.