This board was a wealth of information for me when i was building my kayak, now I'm hoping the resident fiberglass/resin experts can help me with a slighty OT project. I want to make a fiberglass mold of an original sculpture I've carved out of foam. My plan is to seal the prototype, coat it with a mold release and then use polyester (cheaper than epoxy) resin impregnated fiberglass to build up the mold shell. My question is if I could use unfaced fiberglass insulation (maybe 2" thick), satured with resin, to build up the shell quickly and cheaply? Or do you think i should stick with multiple layers of good old 6 oz. cloth?

Thanks,
Jim