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How can I repair a zipper that won't stay locked and unzips?

My daughter has an almost new pair of jeans with a working zipper, except the pull-tab doesn't lock and keep the zipper from unzipping. So every time she sits down or bends the zipper unzips. Is it repairable?
Bev, November 2007
I have the same problem and found this oniline but have not tried it yet:

Paint the zipper teeth with a couple of coats of clear nail polish, and it will stay up. If it starts to fall down again, put on another coat or two until it stays.

marie, November 2007