So as you Wheatless folks know regular dime store playdough has wheat. There is a Wheatless product called Moon Dough that is safe for Wheatless kids to use. It I find it get everywhere. I love the texture but it is so hard to keep together. I will say I've only used the old formula so it is possible that the newer version does not have this problem.
After a bit of researching I came across a recipe for glutenfree playdough on About.com. I have tweaked it just a bit since mine kept coming out too gummy. Here is my final version:
1/2 cup White Rice Flour
1/2 cup Cornstarch
1/2 cup Salt
2 tsp Cream of Tartar
1 tsp oil
3/4 cup of water ( they called for 1 cup)
Food coloring
Mix then put over heat until it forms a ball, about 3 mins. Cool then play!
I found a recommendation to use hot water and I find that cuts down on the time over heat. One person said they don't have to heat it at all if they use hot water. I out mine in the fridge to cool off but don't leave it too long as it will dry out. Learned that the hard way!
Have fun.
