I have made some experimental rough pieces to check the strength of them , I have mixed wet epoxy resin with a carbon dust we generate from sanding , I have also mixed it with some self chopped up carbon fibre and i have laid down some layers of regular 200gsm fabrics and then poured the concoctions mentioned above onto them . The silicon supplier thinks the epoxy will kill the soft mould within 4 parts so I want to nail it pretty much straight away (or I will have to make another mould)