Tag Archives: matthew de genaro

Full reveal

There is nothing left but to remove the model from inside the two halves of silicone mold. Starting at a corner I can peel apart the mold gently all around. Because of the release, the two parts will separate.

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The deep crevices, and where there are holes through the model’s axis, are the trickiest, but because of the thinness of the mold layer, as I had planned and hoped, the mold bends away and removes easily enough, and cleanly, without tearing the model up any. That should mean my wax casts later will come out undamaged and with the minimum about of touchup needed.Those holes through the axis were critical in my planning of this piece from the beginning, in both the design of the model and the mold, and I am grateful that it all turned out so well.

Silicone back-

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Silicone front-

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I surprise myself sometimes. With care and patience, I see that many difficult things are possible. The model, after so many months, now free, and in pretty good shape. And the two mold halves, complete. Complicated. It’s kind of amazing that all of that is two parts. The silicone rubber mold material is amazing.

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The little block mold of the two head-pieces turned out well. I’d had a brief scare where I doubted if I could definitely recall that I had applied the release or not, but I had, it all came apart just fine. I had poured a plaster top for the mold.

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Remove the box

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Split the mold

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Remove the models. Done.

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I’ll clean and wash the molds next. Then, I can’t think of anything to prevent me from casting a wax from this, and that will begin another sequence of complicated events leading up to the bronze pour itself. But before that, I am so overcome with a feeling of relief about this project coming to success that I may want to take a short break and do something nice. The weather’s getter good finally, and this Winter’s worth of effort is completed. It would be a nice thing if I took my wife on a date.

Parting line

I added vents at the ends of the arms. They are cocktail straws, snipped and buried halfway in the clay bed.

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At last I’ll finalize the parting line around the piece for the mold halves. Prepare a variety of clay snakes, collect your favorite tools, and find a comfortable place to work with good lighting:

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Also, have a good cup of coffee, and listen to Radio La 2×4 Buenos Aries. (http://www.buenosaires.gob.ar/la2x4)

The techniques I think works best is, having built up in a general way close to the piece, to now lay a line of clay along the remaining gap of about the same size as the gap or slightly larger, and simply press it gently into place with small tools.

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This neatly fills and seals the gap, without applying pressure onto the piece which will make the clay line difficult to remove cleanly and without blemish to the piece later. The gap must seal completely.

One side done, halfway around.

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And finished, including some keys which can help to keep the two halves in alignment. I don’t take keys too seriously like some people. I think the complexity of the plaster mother mold’s shape, is enough to keep the silicone in place, but people expect to see these in a mold so  do a little of it, for example. I think channel shaped keys like this do more to help prevent material you pour into the mold, like wax or plastic, from leaking out at the seams while it solidifies.

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Next, I’m ready to pour the silicone to form the blanket mold of the first side you see here. Exciting!

Open

I had to go snowboarding again, sun and snow perfect, clear-minded oblivion. By now the plaster shell is really dry. I stand it up and very carefully, open it by inserting some wooden wedges  and tap gently with a hammer. As soon as the suction is broken it comes apart easily. Do not pry. Be patient. I open the mold so as to reveal the first side that I worked on, that hasn’t seen daylight since the end of December. Nice, isn’t it? Face it, there is satisfaction in doing your craft right.

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Now I’m going to remove that pretty clay blanket and reveal the model under it. I’ll use a palette knife to cut and separate the blanket from the plaster,

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carefully peal back the blanket,

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more,

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and more, until the model is revealed, but still resting in the bed of clay which is the second-side blanket. I had done some work earlier on to roughly define a parting line in clay from this first side, when it was still in the cradle, and you can see some of that in place still. The task now is to detail that parting line perfectly.

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I save the clay blanket that was removed, because I can weigh it and know roughly the amount of silicone rubber I’ll need later to fill the void between where the blanket was removed and the plaster mother mold. We’re some way off from that still.

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I cut back the plastic wrap with small scissors, which has been helping to protect the model from the clay blanket to the existing rough parting line,

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and tuck in the loose edges under the rough parting line. This way the plastic is still protecting the second side, you don’t need to remove the model from the mold at all, to get the plastic off, and it’s usually hard to do that without harming the model anyway.

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There we are, ready to begin work on the final parting line. I’ll point out that the outlines will be pretty simple, but the holes through the middle of the body must be handled somehow and even though the silicone rubber material is very forgiving about undercuts and such, I’ll need to proceed with deliberation and reason.

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Shell fini

The box removed, and the plaster shell mold smoothed.

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I’ll just let it cure, dry, and harden up a little longer, so when I split the two half apart, very gently, I won’t crack either half. The clay underneath undulates a lot, so removing the shells evenly, in one piece, using small wooden wedges, will be  a trick.

Meanwhile, on the side, to use up the free time, I cast the Beachstones molds I made last Fall in urethane resin. (The waxes I made earlier from these molds for bronze didn’t work out too well and I’m going to do them over, soon I hope.)

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It still needs finishing, but I’m very please with the way it turned out – that’s saying it came out looking like I’d hoped – like beach-glass, you know, that sand-smoothed broken glass you find at the beach. Look forward to more.