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> […] presumably because silicone bonds to itself […]

Silicone absolutely loves silicone. If you pour silicone into a silicone mould you end up with one piece of silicone — which now includes the mould. So a barrier is absolutely essential.

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Yes, that's why I typed that.

The question is, why make a silicone mould in the first place?

I guess silicone is a good material to make a seamless mould of a smooth object. Since it's flexible you can remove it from the original object without cutting it.

this is the reason.

Even after it's been set or cured, two silicone things will kind of melt each other. It can be disturbing.

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