If it is a metal zipper, this will help. Take a regular lead pencil & rub the sharpened end up & down the zipper while it is closed. The lead somehow helps "lubricate" the zipper.
If it is a metal zipper, rub it with a lead pencil. If it is a plastic zipper, rub it with a bar of soap. Good luck!
My son had a zipper on a shower travel case that was very sluggish, and wouldn't hardly work, probably from being wet. And starting the rusting process. I took some 3 in 1 oil , and rubbed it into the zipper with my fingers. It took some working of the zipper foot up and down, but, we got it going good.
Note: If a tooth is broken within the zipper track, you can sew there so the foot won't go over that part, and then put the rest of your zipper back on track, and just work with the shorter track. we did this on a suitcase.
YOU CAN PUT A LITTLE DISH SOAP ON IT AND ZIP THIS WORKS GREAT ON DRAWERS TO
If it is a metal zipper you can rub a pencil up and down the length of the zipper. the graphite acts as a lubricant.
For your Zipper that won't Zip, try running
the lead of a pencil up and down the teeth of the zipper ( both sides). This has always worked for me.
You can try rubbing the zipper with soap or wax or pencil lead (graphite). Any of these items should help the zipper zip more smoothly.
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