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Message: <blockquote data-quote="Mr Mold Maker" data-source="post: 3676647" data-attributes="member: 28330">In my experience, I'd say the main difference is in strength. Hydrocal cures to a very hard stone like surface, where Plaster of Paris stays very soft and almost chalky. You'll also lose detail very quickly with plaster. For a mold that will cast 5 or 6 pieces? You should be fine.For a head cast you will absolutely want hydrocal.If you use plaster for the head cast, expect to rebuild the ears. You will not get the cast out without breaking them to pieces.  The moisture in the alginate can also affect the plaster and give you an even chalkier surface, which in turn affects the detail that you can pick up.  You are absolutely getting overcharged though.. hydrocal where I live is $25 for a 50lb bag.</blockquote>

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