Bag Zipper Stiff or Stuck? Do Not Force It

Stop pulling and lubricate. YKK says that forcing a slider that does not move smoothly can damage the teeth, and advises applying paraffin or a zipper lubricant to both sides of the teeth and moving the slider up and down several times. This is the manufacturer’s own guidance.

What the sources say

• YKK says that the gearing of the elements, or teeth, can be damaged by forcing a slider that does not open or close smoothly.
• Its advice is to apply paraffin or the lubricating spray “FastenerMate” to the front and back of the elements and to work the slider up and down several times to spread the lubricant.
• Zipper Rescue says that if the slider is truly stuck, perhaps from corrosion, you may have to pry it open and replace it, and it suggests a zipper lubricant afterwards to help prevent corrosion.
• Zipper Rescue also says that a slider that will not close the teeth behind it is usually worn out and the teeth are fine.

What to do

1. Stop pulling, and look for trapped fabric, thread or grit.
2. Brush the teeth with a soft brush.
3. Apply a little paraffin or zipper lubricant to both sides of the teeth.
4. Work the slider gently back and forth over the lubricated section.
5. Wipe off the excess, so it does not mark the fabric.

When lubricant is not enough

If the slider is bent, corroded or will not close the teeth, replacing the slider is often the next step.

Where this answer stops

These are manufacturer and repair-supplier tips. A zipper with missing teeth or a torn tape needs a different repair, and a valuable bag may be better in a repairer’s hands.