Air dry clay is a clay mix that does what it says on the packet, leaving it out in the air is the main way of setting the clay. It is generally very easy to use and tends to have a fine grain making it easily pliable. Once the clay is dry it dries very solid, however extra clay can still be added after the drying process has been completed. Air dry clay can be used to make a variety of different objects. It can be used for pottery or crockery but for decorative use only as any water or liquids added may destroy your creation.