![]() ![]() However, if the mold is wet, it will take a long time for the clay to become leather hard. If you drape a clay slab over the mold when it’s dry, the mold will draw moisture from the clay. Even though the plaster has set, it still contains a lot of water. It’s best to let the plaster hump mold dry out for about a week before you use it. You just need to wiggle it enough for the mold to pop away from the bowl. ![]() Do this gently because although the plaster is now solid, it is still quite soft and cheesy. To remove the plaster hump mold, simply wiggle the sides of the plastic bowl gently. By that time the plaster will have set hard. I generally let mine sit for an hour or so. Then I pour the water outside on a patch of ground in the backyard. Instead, I put some water in the bucket and swirl it about to remove the plaster. This will block your drains as the plaster sets. It’s not a good idea to rinse your plaster down the sink. Plaster sets quickly, and you don’t want it to set on your bucket. Give your bucket a rinse out as soon as you are able. This will break the surface tension of the bubbles. Transfer the alcohol to a spray bottle and spritz the plaster a couple of times. You can get rubbing alcohol from a pharmacy. You can also spray a bit of rubbing alcohol onto the surface of the mix to pop any bubbles. If you dump a lot of plaster into the water at once it won’t mix well. Once you have your water, mask, and gloves ready, add your plaster to the water.Īdd the plaster a handful at a time, and sprinkle it gently into the water. You will be mixing the plaster with your hands, so, wear rubber gloves too. Or better still, a respirator, if you have one. Plaster is dusty and will create fine dust in the air as you work. If you use Potter’s Plaster your plaster mold will weather bumps and knocks in your studio more successfully. Plaster of Paris is often a bit cheaper, but Pottery Plaster no. You can either use Plaster of Paris or Potter’s Plaster. So, it’s best to mix your plaster in a bucket rather than the bowl itself. Once you have measured out your water, pour it into a mixing bucket. However, this increase is negligible, so just use the water level as a guide. The volume of the water will increase a small amount when you add the plaster. You are basically measuring out the right volume of water by doing this. ![]() If you use warm water the plaster will set more quickly and give you less time to work. But it’s best to use a bowl that does not have any patterns or indents on the inner surface. You probably won’t notice these until you start looking. Lots of bowls have some details and textured shapes on their inner surface. If the lip is narrower than the rest of the bowl, you won’t be able to remove your plaster mold. It sounds obvious but it’s an easy mistake to make. Avoid UndercutsĪn undercut is when the lip of your container is narrower than the body of the bowl. Just flexible enough that you can give it a little wiggle. You need a bit of flex in the bowl, so you can pop the mold out. If the base didn’t move it would be hard to get the cake out. To get the cake out, you have to press the loose base up and out of the cake tin. Think about trying to remove a cake you have baked from a cake tin. This is because the plaster creates a bit of a vacuum with the bowl. If your bowl is completely rigid, it can be hard to get the solid plaster out. I have found that the best bowls to use have a bit of flex in them. 3 important features of the bowl you choose: Use a Bowl with a Bit of Flex ![]()
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