Workshop – Plaster sculpting

Before we began our workshop on casting objects in metal, we were first taught how to mix our own plaster. While we had already mixed plaster during our slip casting workshop that was a very measured way of mixing weighing out ratios of water to plaster, we were told it isn’t as important to have such precise amounts for our metal casting, and it’s important to be able to measure things by eye.

First we covered the board with seize, a lubricant to stop the plaster sticking

First we covered the board with seize, a lubricant to stop the plaster sticking

Then we sifted handfuls of plaster into a small amount of water

Then we sifted handfuls of plaster into a small amount of water

 

 

 

 

 

 

 

 

If the mix is thick enough, you will not be able to see your fingers. If it is not thick enough, you cannot add any more plaster at this point and have to start again

If the mix is thick enough, you will not be able to see your fingers. If it is not thick enough, you cannot add any more plaster at this point and have to start again

Continue to add plaster until you see small "islands" of plaster that don't dissolve

Continue to add plaster until you see small “islands” of plaster that don’t dissolve. Stir gently with your hand

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Once you have mixed the plaster, it will begin to chemically react and become thicker. We then had to build towers with this, which was challenging as you begin with a yoghurt like substance which holds very little weight or form, but then ends with a very thick mix which doesn’t bind well with the rest of the plaster. This was the downfall of my tower, as while it was the tallest the plaster was not binding well as when it was more fluid, and eventually cracked and broke into several pieces

IMAG0759

The beginnings of my tower

My tower broke :c

My tower broke :c

 

 

 

 

 

 

 

 

 

 

This technique can be used in order to create sculptures, such as this rooster made by picasso (cast into bronze)

Picasso's rooster

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2 Comments on “Workshop – Plaster sculpting”

  1. Mr. Scade says:

    The Tower of Babylon has fallen.


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