hi all!i am new here, i am sculptor. i 've been cold casting ,resin and in cultured marble. now wants to work in metal but neither have experience nor have foundries which gives facilities to lost wax casting,other than sand casting.that does come to my requirment i know plaster and silicon mould making and wax casting,but have no idea about slurry shell based on which components.or what ratio or component should add into plaster for metal casting? because the place i live plaster for metal casting is'nt avalible accept plaster of paris.so again asking how to add sand or etc,to prepare the plaster for metal casting and what ratio? i'll be very thankful for your help.