hydroperm molds

[Pam B]

I have made a bunch of molds of shells with hydroperm.  My question is simple …do I need to put primer on these molds before using them. I can find no other instructions other than to dry the molds at 300 degrees.

Thanks,

Pam

[Nancy B]

Hi Pam,

While I’m a new fuser and have not used hydroperm molds, I do have info that may help.  In Brad Walker’s book “Contemporary Warm Glass” (p48), he describes 2 types of gypsum cement molds:  hydroperm and hydrocal.  In his description he writes:  ” By contrast, gypsum cements do not need kiln washing.  They are also able to pick up more detail than the other kinds of cements.”    Good luck -your project sounds like fun.

Nancy

 

[Pam B]

Pam B

Thanks so much Nancy.  I opted on the side of safety and put kiln wash on them anyway.  But at least I know now I can skip that step in the future.

Pam

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