Higher settings don't necessarily always mean a stronger seal.We recommend starting low and gradually increasing your settings from 2.5-4.5 temperature grade for the different thick bags,it's better don't exceed 5 Grade temperature.
Do not use wet cloth to clean the surface of heat sealing strip, after 30 minutes of continuous use, try to let the machine rest about 5-10 minutes.
The sealing machine cannot be placed in where blankets, clothes, etc. That cannot dissipate heat. It is recommended to place it on the table top.