Once your silicone has fully cured carefully cut away the clay from outside of the aluminum mold walls, and peel back the aluminum walls from the silicone surface. If you made aluminum walls (like I did) don't throw them away yet, you will use them again for the opposite side of the mold. If you built your mold walls out of clay then you will need to do that again pretty soon.
Flip your mold over and carefully begin to remove the clay from both your sculpture and your mold surface. You want to be very careful here because you do not want to accidentally pull your sculpture out of the mold (just your clay lay-up).Your sculpture is now half embedded in silicone and the silicone should hold on to it fairly well, but if you are not careful you can pull your sculpture out of the silicone. If you do pull your sculpture out of the silicone it can be very tricky to put it back in precisely, and your finished mold will suffer for it. You can also see why we wrapped the clay in saran wrap. If the clay that we are removing here was allowed to harden, this step would give you nightmares (trust me, I've had a few).
Once you have all the clay removed from your sculpt and mold surface, you need to clean the area off. If you sealed your sculpture before molding it this step will go very quickly. Get yourself a brush and some water and remove any clay residue from your mold surface and your sculpture. Pay particular attention right up against your sculpture. Check that all your sculptures detail is clean and that there is absolutely no clay residue left anywhere.
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