2 c. salt
2/3 c. water
1 c. cornstarch
1/2 c. water

Stir salt and 2/3 cup water over low to medium heat for 4-5 minutes. Remove from heat, mix cornstarch with 1/2 cup water, and add to first mixture. Stir until smooth. Return mixture to low heat and continue o stir. The "goop" will thicken quickly. This may be used for modeling and will not crumble when dry as some clay products tend to do when unfired. Store unused portions in plastic bag.