Not sure if anyones interested but just to finish up the thread ended up making two fibreglass moulds and making the bells single skin fibreglass. Thanks for all the advice crew.
Hi Just a quick update. Got some self skinning soft urethane foam today and cast it in a small test bell mould with some pigment and managed to get a good part out pre colored and reasonably strong so things are looking good.
Obviously plug is nowhere near shaped yet . Still open to suggestions for casting / construction methods? I'm currently leaning towards casting a flexible expanding urethane foam in a fibreglass mould.
Hi Pork and Beans thanks for your help. After talking to reps at smooth on Im currently leaning towards a hardish expanding urethane foam cast in a fibreglass mould material cost will be around $30 a bell so that's in our budget. I still have a bit of time to decide but just started on the plug...
Thanks for the reply TK7713Gra30. You have helped me make up my mind and i'm steering away from Urethane now due to high cost and too many unknowns. I can get two + fiberglass bells out of two moulds per day. cost of tooling for fiberglass moulds is far cheaper than silicone but there will most...