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Can I add additional uncured silicone rubber to a silicone mould that is already cured?

As long as the surface of the cured rubber is kept dust and grease free, more silicone rubber of the same type can be poured on top and will bond with the surface. There will be no detectable join. (unless a different coloured catalyst is used, of course) If the above is strictly adhered to then there are no time constraints.