We often encounter this situation when using sand tapes. It's not easy for them to stick after a period of time, and they may easily break due to incorrect storage methods.
Sand belts cannot be stored in places with significant temperature and humidity changes. The ideal temperature is 18-220C, and the ideal humidity is 40-65%. Due to excessive temperature, the adhesive will age and the service life of the sand belt will be reduced. High or low humidity can cause deformation of the sand belt, which can reduce the bonding strength of the sand belt adhesive layer.