1 c. cornstarch
2 c. baking soda (1 lb.)
1 1/4 c. cold water

Stir in a saucepan over medium heat for about 4 minutes until the mixture thickens to moist mashed potato consistency. Remove from heat, turn out onto a plate and cover with a damp cloth until cool. Knead as you would dough. Shape as desired or store in airtight container or plastic bag.

Dry overnight and paint. Brush with shellac or nail polish for sealer. Can color water before adding to soda and starch.