Why is the glue easy to block?Solve this problem

Why is the glue easy to block?Solve this problem

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Why is the glue easy to block

 

Why is the glue easy to block? After cleaning the mouth of the bottle, press the bottle firmly for 5~10 seconds (to expel the air) and wipe the mouth of the bottle with glue, then tighten the cap, and then loosen the bottle.

 

Why is the glue easy to block