Cement is a bit like plaster, it can be used to make prints from a mold, it is plaster, silicone or latex.The draw takes place after making a mold of the original.
Once the original cast, remove it. The empty place that is borrowed will receive casting material which will give the new copy.
Ideally with cement is to have a mold consisting of a part silicone or latex on the hull of plaster.
Because when you take a plaster mold it drinks the water when the cement mixture is poured. This effect is not very good,concrete cracks and eventually become so friable that the use of latex or silicone containing well water and can even drying and optimal.
The use of a mold-sock latex is a fairly efficient way to conduct a sculpture in cement. Poured cement in the "glove" latex back and it has only shot to remove it when the drying time is reached, moreover, it can be used many times.