That actually is pretty cool. I would think you could do this with any epoxy putty that's out there... and if you did it correctly and planned ahead you culd probably make good 2 part molds that can fit together well enough to pour resin into.....
HMMMM.....
IDEA!
using this method to make 2 part molds for weopons that can't be molded in the traditional one part mold style that we've been using with the silicone might work realy well....