Use after cleaning the bottle thoroughly. Place the lettering side of the seal into the bottle cap, apply a little pressure to fit it tightly. The white side of the seal should face down, and the side with black letters should face up. Screw the lid tightly, and the pressure of applying the lid activates the seal and will adhere within 12-24 hours.
  The foam lid liners are made of polystyrene foam with an excellent leak-proof effect, keeping odors and dust out. The dustproof yellow paper backing keeps the foam lid clean and provides long-term protection. Once used, remove the paper backing to apply to your items or reseal. Note: Always check the outer diameter before purchasing and store away from direct sunlight and high temperatures. Once the seal is removed, the tightness will be affected when reused. The pressure-sensitive liner is best sealed with powder or dry products, not suitable for applications containing oil. Avoid overfilling the container.