How to make plaster molds for bowls

I make a lot of my bowls using plaster of  Paris press molds.

spirit bowl

stag beetle bowl

Stag party bowl…

And I always need new molds, so when I spotted this  handsome beach ball….well.

It had to be done.

To make a mold from a ball, you encase the lower half of the ball in clay

Then you build an even bigger wall outside the first clay wall. Make sure you secure it using clay blobs at the base. Once you pour in the plaster of Paris, you need the walls to be strong enough to handle the outward pressure.

Mix up your plaster of Paris and pour it in. When the plaster goes off a little bit, you can use your hands to heap it up on top of the ball. You don’t really want a square mold because it will be very heavy to use. Just make sure the walls are at least 1 inch thick.

When the plaster has cured, you can remove the clay walls.

And liberate the plaster mold.

It will need cleaning up; a surform will come in handy.

I would recommend experimentation; what could possibly go wrong?!

To see more of my work, please visit my website at www.annakeiller.com

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About Anna

I am a ceramic sculptor living on the South coast near London, England. My work is influenced by my experience of the earth as a living being and seeing how we are all connected with eachother and with the things that surround us. I create ceramic torsos using molochite clay which I often smokefire in galvanised dustbins. I also make House Gods to protect and amuse, and Fat Birds - little smokefired sculptures that tell the story about what it is like to be a fat bird at peace with its surroundings.
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4 Responses to How to make plaster molds for bowls

  1. I agree – very cool! Love your blog, Anna, and hearing how you make your work.

    Like

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