After the rubber cures for 4 hours, remove the mold walls and lift the entire mold to separate it from the base. Now, remove clay base.
You will need to cut your mold open in several areas in order to demold your original piece. It is helpful to have a friend help hold the mold open while cutting. Follow the guide lines that you drew on the original model. You will need to cut in between each finger to allow for an easier demold. Continue cutting just enough so that you can demold your original. The mold captured all the detail from the original model.