You can brush silica gel directly on the outside of the sludge, brush one layer, cut some gauze of different sizes, brush the second layer of silica gel after solidification, cover the gauze with the sculpture appearance, brush another layer of silica gel after solidification, cut off the divided mold seams with a utility knife after solidification, insert the slices cut from the can into the gaps, and then make a movable outer mold with gypsum. Parts with hook or jam should be made into small pieces. The proportion of silica gel curing agent is about 5%, and the proportion of resin catalyst and curing agent is similar.