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Unfortunately, I have not attempted this, so I'll be of no help there. If you already have the two piece mold, I'd try to lighten up the resin mixture with microballoons. Set some pins in the mold to hold a pre made through-wire with any weights positioned on the wire. You could try 3oz part A and add 1oz microballoons. Separately, 3oz part B and add 1oz microballoons to it. Calculate the amount needed for the pour, then add the two mixtures accordingly. Im sure this will give you plenty of buoyancy, and will then give you the freedom to place weight where you wish to get your desired action. Other than that, Nebe's above method will put you on the right track for a hollow two piece. If you took the wood master and cut out 1/4" out of the center, and used it to press the clay in the existing mold, it would give you a fairly even 1/8" wall thickness. Hope this helps,
Douglas
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