The Squeeze and Flo Water Brushes can be filled with water so that you can keep on painting without having to head to the water cup to moisten your brush. I use mine for black and white, and it helps me paint my spider guys webs sooo much faster. I just hold the black cake in one hand and squeeze my brush over the paint whenever I need more water. Make sure to empty the brush as the end of the day and let it air dry. This could be a huge time saver at your next event!