Why is the slider not closing the chain?
Check that the slider and chain are from the same zip supplier and are the correct sizes to match one another.
Why is the slider sticking / jamming on the chain after insertion?
Check that there is sufficient clearance for the slider to pass along the length of the zip. Check that there is no adhesive accidentally applied to the zip teeth or inside the slider during insertion. Check that no side seams interrupt the travel of the slider along the chain. Recommended distance is 2mm from the […]
Why are there stain marks to be found on the fabric adjacent to the zip?
Check for any solution / sprays / polishes being used on the zip teeth. Check for any excess oil being used on sewing threads if sewn application or check temperature of heat seal if sealed zip application.