The work used: extruded polystyrene foam (penoplex), acrylic paints, matt acrylic varnish, gypsum in a ratio of 1 part of water to 2 parts of gypsum.
Styrofoam crafts are waterproof, easy to work with, and durable. I also have New Year's crafts made of expanded polystyrene that are not afraid of frost and snow.
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Playlist "Crafts from foam and foam" # 1:    • из пеноплэкса и пенопласта  
Playlist "Crafts from polystyrene foam and polystyrene" No. 2:
   • из пеноплэкса и пенопласта № 2