I've not used a quantity large enough for that purpose. (I normally only use small amounts at a time for pouring into my tights so have used the non-powdered variety from artists' supply shops.) However, you might find
this article I wrote about the subject useful as it has supply and mixing tips etc.
It's certainly the best substance I've found due to the excellent paint-like dense coverage, silky-smooth feeling and easy clean-up. I normally use 'modelling clay' as it's really plastic and smooth. Make sure you don't get anything with 'grog' in it - sand particles - great for pottery but not for sploshing!
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