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I haven't tried that. I do get preey good results with placing the item to make the mould from on a small piece of flat glass and buiding up a dam around it with plasticene or small glass slips with...

I have made a fair number of scales using this method, using acrylic, polyester, polyurethane, epoxy and urethane resins and pourable (aka "RTV") silicone to make the initial moulds with. If you...