Simply put this is air drying clay. It is easy for children to make into whatever they want and then when it is left out to dry, for a day or so, it is hard enough that they can then paint it. You get 4lb of the stuff which has been enough to keep my two children busy with it since Christmas - they have made a couple of bigish things with it each and we still have lots left. It is quite difficult for small children to actually get it out of the packaging so it will probably involve some parental involvement, and they will get it everywhere if not supervised. It does dry out, but can be a swine to get out of clothes if simply left (lots of soaking has worked for us).
You will need to think about where you are going to store it, as it dries out, so make sure you have a large airtight plastic box to store it in after people ave finished playing with it.
It's good fun for people who like playdo, but want to make something more permament.
Used by both my daughters (4 & 7) to make rather lovely shapes that only children can make. It dries to a light grey colour. I leave it overnight before painting ... it feels dry quite quickly and the children want to paint almost immediately, but it won't have set all the way through and they'll end up wrecking their creation.
It's a messy task so aprons and old clothes. I have an A2 sized piece of plywood that works well as a surface. Old play-doh moulds and tools are quite useful.
The clay is tightly bound in a plastic membrane and a foil package (quite difficult to get the clay out). I tend to cut the packet carefully and then roll the top over and keep it closed with a clothes peg. I would not suggest just putting it in an air-tight container unless it's quite a tight fit inside; otherwise the trapped air will harden the clay over time. Close wrapping in cling film first seem to work though.
Anyway. I have to buy more soon ... and some paint!
this clay dries as would normal clay it is just a tiny bit less brittle than normal clay as it contains tiny fibre hairs. doesn't dry in to unbreakable hardness as I thought. still good fun for the kids