Im making a fake head and I already made a mold.I need somthing cheap to fill it with and not a mask! fill all?

I DON'T WANT A MASK! I WANT TO FILL THE ENTIRE MOLD!!!!! PLEASE HELP! EVERY THING I WANT TO USE IS NOT RITE! Balistics gel molds and smells bad. Gel 10 is too expensive! I need to fill 4 pints worth under $25!Im making a fake head and I already made a mold.I need somthing cheap to fill it with and not a mask! fill all?
try foam..you can buy foam kits that you have to mix or there is the spray kind too. they are pretty close to $25 for quart size kits.Im making a fake head and I already made a mold.I need somthing cheap to fill it with and not a mask! fill all?
maybe plaster. it depends on what the mold is made of. if its silicone using expanding foam would probably ruin the mold.

theatre