You can fix a stuck zipper by running a candle up and down on the teeth of the zipper. You should then be able to slide it the back and forth easier.
By gerique from Cleveland, Ohio
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To unstick zippers, I have always used a bar of soap or crayon. If that does not work, use a wax like a candle.
The teeth of the zipper is one my problems almost all the time. When I slide through the chain, it won't run smoothly. Before sliding to the chain (teeth), I rub the the candle on both sides. Do it at least 3 times before you zip it.