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Right before you pour the cement in your molds, try dipping them in a bowl of soapy water (just plain old dish soap), then shake the excess off. The soapy residue will reduce the surface tension, and make it easier to tap all the bubbles out of the nooks and crannies of the casting.
I make minis and modular dungeon tiles in a similar way as this. I've used Quikrete before, and haven't been all that happy with the results. Rocktite Expansion Cement seems much better for replicating the fine detail...and is more shatter-resistant, when dropped. Give it a try sometime, you might just prefer the results!
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