Soak water sprite in water, and water sprite will become bigger when it absorbs water. 2. water sprite is a kind of water-absorbent resin, which is generally made of starch mixed with acrylonitrile or acrylate, so it will gradually become larger after being soaked in water.

　　1. Prepare materials. Ordinary glue (effective or effective), water, containers, borax water.

　　2. The foam rubber needs to be adjusted in a reasonable proportion in the production process, so that the foam rubber toy with suitable hardness can be made.

　　3. When making foaming glue, the ratio of water and glue is very important. Try to keep the ratio of water and glue around 1:2 for the first time.

　　4. In the later stage of mixing, it is necessary to adjust the proportion according to the situation, and add materials with foaming effect for mixing. After it is roughly completed, borax water can be added for the final solidification treatment.

　　5. If the foaming glue is hard, you can add a little extra water. When stirring, the hardness of foaming glue can be adjusted by adding water and glue according to the actual situation.