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