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Ive just done a 4 part mould and being much smaller but complicated used the silicon to seal . To help when demoulding i use wax to give split points at the edge of the flange joins, this allows me to get a bar in between the mould parts and break the silicon seal.
like Hanaldo says you could use strips of sheet wax to give a gasket groove that could use vac tape or even a rubber seal similar to the rti light, might be rtm I'm unsure of the name but videos on you tube.
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