Hi
Please note not a teacher nor a native speaker.
I understand that you use cast and mould as verbs.
I did a little research and it seems that mould is used mainly with things that have high plasticity, and the shape can be given using hands or simple tools.
such as :
plastic
clay
wet sand
wax
gold
silver
cheese
flesh
body
breasts
shape
personality
life
PS.
Cheers
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