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I've been a sewing professional for over 30 years. This is only a temporary fix, and will not be very attractive. For nicer items and long-term use, seek out a professional in luggage/shoe repair shop or an upholsterer to replace at least half of the zipper if not the whole thing for items that you want to maintain in more pristine fashion. Also note, normal sewing thread is not strong enough to last many zips. A heavier thread would last a bit longer.