While the concrete is wet insert several straws through the top of the mound.
Concrete fire bowl molds.
Largest selection of sink fire bowl planter molds.
Keep the wet concrete covered with plastic sheeting between layers.
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There are several parts to the mold to form both the inner and outer concave edges.
Sink molds can be used to form sinks that blend beautifully with any countertop.
Are you looking for commercial or ornamental concrete molds.
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You will want it to be 2 or 3 inches thick for strength so mix enough concrete for your size bowl.
Once you have all the things in place its time to get started by using the twin bowls as molds to create the concrete fire pit.
For the do it yourselfer the styrofoam option is usually the best choice.
Once the concrete has cured remove the molds and fill the concrete bowl with fire safe stones from a fireplace store ordinary rocks might contain air pockets and moisture that cause them to break or burst.
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Mold the wet concrete over the mound of sand.
Crete molds line of fiberglass concrete fire bowl molds are manufactured for unlimited castings.
A concrete bowl is made using a mold usually cut from styrofoam or cast in rubber.