With prolonged usage, zippers can become loose and begin to “unzip” themselves. There are several DIY ways to fix a zipper that won’t stay zipped up, such as using pliers, nail polish, hairspray, a hair tie or a key ring.
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How to stop my zipper from falling down - Quora
How to Fix a zipper that won't stay up
Fashion Hack for a zipper that won't stay up! #problemsolved #yougotth, zipper splitting apart
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