Unstick a difficult zipper with one of three secret style hacks. You can use crayon wax, Vaseline, or even the tip of a graphite pencil along the zipper to loosen it up.
Just pull the zipper taut, and add your substance of choice (or convenience) along the zipper’s “teeth.” Then–holding the open end together–pull through the coated teeth, up or down.
The wax, vaseline and graphite each work to coat the zipper teeth and make the process of zipping smooth and easy. After your zipper feat, be sure to rub away the substance with a tissue or paper napkin. Then be off on your way, in style.