If you have a sticky zipper on a piece of clothing, try rubbing the zipper with a pencil.  The graphite in the pencil should help lubricate the zipper.  A bar of soap also can be effective.
By Fisher
Bar wax will fix any sticking zipper problem, my mom has used it for years (07/22/2006)
By alan
This works on metal zippers.  For plastic ones, run a candle across the teeth. This also works for the metal ones. 
(02/15/2009)
By Grandma J
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