how can i made pots (clay, hipertufa, etc.) molds?

i want to know how to do cheap, easy to do molds of wood or any easy to find material to cast pots in many forms (oval, round, square, rectangle, etc) to cast in concrete, hipertufa, clay or any common sturdy material like such. any sugestions welcome :)

Ninzerbean7 years ago
What ever you use - wood or plastic bowls you will never get clean again, use a lot of release agent. On wood I used vaseline and for plastic bowls I used a spray non-stick cheap oil. As far as molds go I was lazy and looked for bowl in plastic that were the shape I liked. When I made a big planter I built a wooden frame and inserted a big box inside.