For this project, craft foam is used to create a multi-part mold which is then held together with modeling clay. The foam creates a nice "matte finish" on the surface of the plaster. Then paint is mixed with non-sanded tile grout to give it a chalkboard finish in any color of the rainbow.
Step 1: Supplies
Plaster of Paris
Container in which to mix plaster (about 3-4 cups volume)
Plastic Silverware to mix plaster
Laytex Paint (Matte or Eggshell finish) OR Craft Acrylic Paint
Non-Sanded white grout
Fine grit sandpaper