You ll want to do this so you can see how much concrete you will actually need.
Large concrete bowl form.
A concrete bowl is made using a mold usually cut from styrofoam or cast in rubber.
Use light pressure and push until the concrete mix raises to the desired height image 1.
Then press the smaller bowl into the mixture in the center.
Add concrete to the large bowl.
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Pour concrete into form with your concrete at the right consistency quickly and carefully pour the mix until you fill the large bowl about halfway.
For the do it yourselfer the styrofoam option is usually the best choice.
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I used the same large bowl but it scratched from the shovel transferring to the form.
Then sit the smaller bowl in the form and press down.
There are several parts to the mold to form both the inner and outer concave edges.
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Next you can oil your large bowl to provide an easier release.
Press the top bucket firmly into the concrete mixture and press down as far as possible to form the hole for the inside of the bowl.
Using gloves or a plastic bag over your hand smooth the outside edges of the cement bowl.
Do not overwater it.