1. After the mold is aligned, clamp it with a clamp (note: the clamp used must be firm), and then check whether the mold is aligned.

2. The first layer: add half a bowl of clear water to the bowl, then add a proper amount of gypsum powder (the ratio of water to gypsum powder is about 1: 1.8), and then stir evenly to make it bubble-free. If the gypsum powder cures faster, the proportion of water is slightly higher.

3. Pour the stirred gypsum slurry into the mold, rotate the mold quickly to make the gypsum slurry stick to the mold evenly, and put the mold on the flat ground or hang it, as shown in the following figure, to prevent the mold from deforming.

4. After the first layer is dry, repeat it two or three times according to the speed-up method. Before the construction of each layer, the next operation can be carried out only after the first layer of gypsum is dried.

5. Back cover: First find a foam pad, then pour the prepared gypsum slurry into the gypsum image product, then shake the gypsum image as shown in the figure, cover the foam pad on the bottom of the gypsum image, then erect the gypsum image and shake it back and forth to make the gypsum slurry in the gypsum image fill every position at the bottom of the gypsum image, and finally put the gypsum image in a flat place and trim the excess gypsum at the bottom of the gypsum image.

6, demoulding: after the gypsum is solidified, put the plaster image on the flat ground, first remove the clip, and then slowly peel off the mold from the bottom with both hands. When demoulding, slowly demould the mold by hand to the inside of the mold. If it is difficult to demould in a complicated place, you can pour some boiling water on the surface of the mold to soften the mold before demoulding. Now take off the foam board at the bottom, and then trim off the excess gypsum at the bottom with a knife.