Didn't stain the concrete and the form came off easily.
I used Trader Joe's olive oil spray.
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Concrete is porous. The oil would seep out of a tank made of
concrete.
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vegetable oil
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you need to have a ''keyway''---that is a groove in the base
concrete,can be cut in if concrete has set,if not set,oil a
2x4lightly(lightly) & imbed it into the base concrete
flush.