It should work for any non-porous model. Otherwise, you would need to be sure to seal it with either a designed sealer, or lacquer, or something of that sort.
What could potentially cause issues with a hand, might be undercuts. As long as the fingers were fairly close together and somewhat straight, it should be possible. Otherwise, you'ld probably want to go with a 2 (or more) piece mold.
The larger the item, though, the more you're going to have to look at reinforcing the molds to help them keep the shape, which I'll be getting into as this goes on.
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