<human>: Is there a way to make a sand-castle mold so that it can be used over and over again?
<bot>: Yes, you can make a sand-castle mold by using silicone or polyurethane casting materials. You will need to mix the two materials together in order to create a solid mold. Then, you can pour wet sand into the mold to create your castle. Once the sand has hardened, you can remove the cast from the mold and use it again.