There are 3 types of clay; oil based, water based and polymer based.
Water based clays (WED Clay)e.g are soft and easy to use, but need to be kept wet/moist, so you will need to spray with water periodically and wrap them up so they don't lose moisture. If they do, they will split and crack.
Oil base clays (e.g Chavant, Monster Clay) do not need this level of attention. As far as I know they will remain as you leave them for an indefinite amount of time.
For both of the above, you will need to make a mold of the sculpt and cast them in a suitable material(e.g resin) in order to finish them up.
Polymer clays (e.g super sculpey, fimo)have the advantages of the oil based clays but can also be fired in an oven and become rock hard. So you will not need to mold and cast a polymer clay sculpt; once it's hardened, you can prime, paint and display it.
Sometimes polymer clays, when exposed to the air, leach out their natural oils and become dry and crumbly. A crumbly batch of super sculpey can be restored by adding some sculpey diluent/softener and kneading till soft again. Otherwise keep your sculpey in an airtight container.
So...as said before, it all depends on what type of clay you are using. My advice; start with super sculpey and then work your way around...
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