How to make a mould using your clay sculpture:

(My notes, step-by-step)

 Equipment:
-Clay sculpture completed and attached to the plastic base
-Wooden sticks
-Gloves
- Plastic measuring cups
-Fixing spray
-Petrolease
-Silicone A
-Silicone B
-Glue gun
-Scissors
-Scales
- Cotton buds 
-Baby wipes

- Make sure you are wearing gloves and change them frequently to avoid contaminating products
- Mark wooden sticks with 'A's' and 'B's' to make sure you don't mix an A stick in with the Silicon B, and vice versa.

Prep:
 1)  Take fixing spray (shake well) and spray over your clay mould near an open window (approx. 20cm away from the sculpture).
2) Then repeat first step but instead of using fixing spray, use petrolease.
3) Once the petrolease is dry, cut a plastic measuring cup in half (throw away the closed bottom half) and place the open topped half of the cup over your clay mould. 
4) Take a pre heated glue gun and apply a generous layer around the outside of the plastic cup, placed firmly over the mould. This will block any silicon excaping under the cup. Once you have made sure there is no gaps for silicon to leak out and that a sufficient amount of glue has been applied you should wait for this to dry. This process requires a lot of patience inbetween each step. Now the clay sculpture is prepared and ready to be filled with the silicon mix to make the mould.

Making the mould using silicone:
5) Take a fresh cup, we will start measuring the correct and exact amounts of silicone A & B. 30 grams of each.
6) Make sure you replace your gloves and cover the scales and surface with clingfilm to avoid any contamination
7) Use the wooden sticks (Marked clearly 'A' and 'B') to transfer silicone from the tub into the cup
8) Change gloves when changing between silicones
9) Once you have an equal amount of both silicones use a wooden stick to stir well and remove bubbles
10) Once pleased with your mixture, pour into the mould and use the wooden stick to make sure it all goes in. Once the mixture is all in the mould and ready to set, throw away the used cup.
11) Wait for the mould to set  

Silicone over the sculpture, ready to set as the mould

Mould ready to be used to create flat pieces