For this mould I am using a cold cure rubber, which comes as a thick white liquid, and a red catalyst. Using the clay I removed earlier, I was able to get a good idea of how much rubber to weigh out.
Once weighed, the parts were mixed together thoroughly by hand until this nice pink even colour was achieved (below), then it was mixed some more just to make sure. Using a clear measuring jug helped me to see if had reached all of the 'corners'. then the rubber was allowed to rest for a short while to let some of the trapped air to escape.
Once rested, I poured the rubber into the plaster jacket, I made sure to hold the pour spout high enough away from the clay cup to help expel any further air bubbles in the rubber. The mould was filled right up to the top of the cup, allowed to rest and then topped up. you may notice that the airs/straws are the same height as the cups, this allows the rubber to level out above the height of the mould.
Finally, the table top was gently vibrated using a drill to help any trapped bubbles to rise up through the cups/airs. The rubber was then left for 24 hours to cure.
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