TIZIP MasterSeal zippers need to lubricated on the docking end from time to time.
Please use the original TIZIP Lubricant or other available zipper lubricant.
Carefully apply over the docking end surface on front, back and inside where they connected to the zipper chain.
Repeat before long term storage (leaving the slider closed) and whenever the area is dry during use.
If the lubricate is not done properly, please be aware that water leakage may occur. Excessive lubricant may stain fabric!