Step 2: Making a border
Now unfortunately I did not take a picture of this, but I found a good example from another sculptor, and how he does it in the link below.
..... I really dont need to show you any more about this.
Ps. Make sure to spray your sculptor with a good amount of cooking oil to make sure it doesn't stick, and make sure to get out as many air bubbles from the plaster before poring.
Step 3: Breaking your mold open
Your next step is to simply remove any of the existing sculpture inside, be warned, this can be a heart breaking sight.
Once youv done that you need to go through and fill any small air-pockets that may have formed from the bubbles in the plaster.