6 parts play sand - you can get a bag at Home Depot really cheaply - it also comes already colored if you want that
3 parts cornstarch
1.5 parts water
Mix up the cornstarch and water first until smooth. Then, mix in the sand 1 cup at a time. Store in an airtight container. You may need to add a little more water each time you play (depending on humidity - a couple of tablespoons). But, in order to make a product that never dries out, I can only imagine that it is full of gross chemicals - I think that the patent calls them copolymers of vinyl or acetate.
Will this moon sand work underwater like the other stuff? Who knows - I haven't tried it like that. Water, 3 year olds and wood floors don't mix - but for cutting and molding it is nice.
Also, you can add glitter to make it sparkle. Glitter is available many places very affordably and most kids - boys and girls alike tend to love it.
