if you decide to use plaster here is a tip: have a partner and yourself mix up the quantities in separate buckets. eg if you decide you need 4 kg to cover the fluke for the initial mold then get your partner to mix up 2 Kg then both pour together from the one point. this will ensure that you cover the entire mold without having uneven sides. speaking from experience here. NB any unlevel mold can resort in silicone pooling on one side of the mold or even spilling over the edges of the mold. this usually only happens in the thinner spots. ENSURE WHEN MAKING ANY MOLD to create the mold on a LEVEL Surface. you will be looking at a thickness of about 2 to 3cm for the mold to ensure it won't crack upon lifting.
fluke thickness, ive created mine to be around 3cm thick at the top once the halves are put together and midway down is about 1 to 1.5cm the bottom is left around 3mm. you won't most of the thickness up the top and centre in order to act like a monofin. NB something to think about, the thickness you do your fluke needs to be taken into account in order for your extension to be able to take the weight of the fuke.
what are you casting your fluke in? silicone or silicone Rubber?
your fluke looks good. just a reminder your fluke needs to be symmetrical on both sides in order to add up.
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