Zippers that stick and are difficult to zip are a real pain! Sometimes the problem included “dirt”. Bee’s Knees Zipper Wax suggests that you clean your really stuck zippers first. Use your BKZW brush, to remove dirt and grime. Then lightly coat the zipper on all sides! Remember if you can see Bee’s Knees Zipper Wax on the stuck zipper, you have used too much… Then just slide the zipper up and down, up and down.. you will bee so happy !