Mix the blue molding compound with water in the bucket supplied, dip your hands in the desired position, wait a little, carefully pull out your hands one after the other. After drying, fill the resulting mold with white plaster. Allow to harden, remove elastic impression material. After drying, the model can be edited with the sandpaper.
The molding compound hardens very quickly and becomes rubbery. Therefore, the immersion after mixing must be done very quickly. The form can only be used once. Precise instructions are included in the package to ensure that the impression is successful in any case. You can find some videos on YouTube about making hand models with impression material.