MONSTER CLAY MOLDING

I can't seem to find a straight answer to this anywhere on all of the whole entire internet, so I'm taking it to the forum... If I've sculpted a head in Monster Clay and i'm about to build a mold around the head in Hydro Cal, do i need to seal the Monster Clay sculpture with Crystal Clear or any other adhering preventative? Or can I just apply the Hydro Cal directly to the Monster Clay?

I ask because while it would be great for the mold to just pull away from the sculpture with a non-adhesive applied, it would also be nice to be able to re-use the Monster Clay for other sculpts and I'm guessing the non-adhesive would taint the Monster Clay for future use.

Can anyone advise? Thanks! 
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