Plaster sculptures are fun to make, but let's face it—they're a little messy. But never fear: in this activity, your preschooler can experience the tactile gooiness of plaster without all the mess. Putting all the ingredients in a plastic sandwich bag makes clean-up a breeze.
You may need to experiment with the ratio of plaster to water before beginning this activity. Try half a bag of plaster and 1/4 cup water to start.