When condensed liquid silica gel meets dry weather or insufficient water, after adding 2-3% curing agent according to the proportion, the silica gel will show the phenomenon of surface drying and internal non drying. Whenever this happens, the simplest solution is to add 2-3 drops of water to the silica gel. After fully mixing, the silica gel mold can be completely cured and the toughness of the silica gel mold can reach the peak.