The final step is to pour the silicon rubber into the shell. The rubber coats the face inside the shell capturing all the details of the surface. This particular silicon is called Mold Max 30 and takes about 8 hours to set. Once the silicon is ready I take the mould off of the board and remove the face. What I'm left with is a perfect negative impression of the face. The advantage of rubber moulds is that they can produce a high number of casts before they deteriorate. I still don't know how many we plan on making but the sky is the limit!
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