Mould making - Part 1
Silicone Mould Max and Catalyst
The catalyst is mixed 1/10th of the silicone being used. For professional moulds it’s best to use a vacuum machine to degass - remove the air from the silicone before it is poured. Degassing the silicone will ensure there are no air bubbles - especially near or on the detailed parts of the object. This is absolutely essential for smooth accurate moulds. Vacuum machines are affordably priced and can be obtained from a laboratory equipment retailer.
The Silicone and catalyst must be mixed thoroughly and it’s best to use cheap cups.
Wooden tongue depressors are the best for mixing the silicone and catalyst together. Chop one end off to form a straight edge.
Petroleum jelly or vaseline is essential for making two part moulds. Smearing the jelly over an object or on a silicone mould will prevent a silicone pour from adhering to the object or mould. Silicone naturally adheres to itself so a barier cream is necessary.
More about mould making later.