One interesting method we learned in the mouldmaking and casting course involved sculping a small version of our hand to mould and cast it. I drew the outline of my hand on a piece of paper which was scaled down 1/3 (the sketch, not my hand ;-O ) so it measured about 8 x 8 cm. For the sculpting, we used sculpey to make a detailed “copy” first of our palm and second of the top of our hand.
Hmm, I thought, my hand looks interesting, but I find a MONSTER HAND with claws much cooler 😉 So my two little flat sculpts got a bit chunky with some nice long nails, and it sure was tricky without really being able to put them together to check if they fit (because then the sculpey halves would have muddled together).
Strange? Yes! But hang on, the conclusion is on its way!
So the first hand-half was put on a board, a “wall” was built around it (YAY, a perfect occasion to play with Lego 😉 ) . The wall was brushed with vaseline and plaster was poured on top of the sculpey hand-half. The plaster had been prepared beforehand (NEVER pour water into plaster, ALWAYS shake the plaster caaarefully and sloooowly into the water). When it had set, the first part of the 2-piece-mould was finished and the sculpey hand-half was taken out.
The same procedure with the second hand-half: put on a board, built a wall, vaselined, poured plaster, waited, took out the hand-half when the plaster had set and the second part was finished.
What happened then?
Alginate was prepared with a lovely lively monstrous green colour pigment. This liquid was poured and brushed thoroughly and VERY quickly (the liquid started to cure within minutes) in both separate halves of the plaster moulds – and with a bit of courage put together and fixed with a strong rubber band. After a short while, there it was, the moment to see if the two halves really had “met” and turned into a smooth, whole and complete hand.
Yes! They did! It had worked fine! Now I have a really cool little green soft flexible rubbery jelleyish monster hand with perfect fortune-telling lines in its palm 😉
(pic by Th. Schramm)
….and is there anymore?
The next and final post of this mini-series will tell you how a full 3 D mould for a little soap stone dragon was made – involving silicone rubber, plaster jackets and casting tricks.
Until then – be well, dear readers.