2 cup Cornstarch
4 cup Baking Soda
2 1/2 cup cold Water

Measure the cornstarch and baking soda into a pot. Mix and add 2 1/2 cups of cold water.  Place on medium heat.  Stir for about 5 minutes, until the mixture thickens.  Remove from the heat.  Cover the pot with a wet paper towel.  When cool, knead for about 5 minutes, working on a surface covered with waxed paper.

Allow objects to air-dry before painting.