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42757Re: [hobbicast] Need advice

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  • Dan Brewer
    Apr 10 1:21 PM
      The big difference is that when fired the substrate will no longer adsorb
      any moisture. The term used to describe it is vitrification or to become
      like glass.


      On Wed, Apr 10, 2013 at 8:42 AM, Yvanwolvesbane <yvanwolvesbane222@...
      > wrote:

      > **
      >
      >
      > Hey there, folks-
      > PoP I'm familiar with. This is the first time I've heard of American
      > Plaster. Is it known by other names? What makes it different from PoP?
      >
      > Mark Feldmann/
      > Yvan Wolvesbane
      >
      > Pacifist with occasional lapses
      >
      >
      > On Apr 10, 2013, at 9:52 AM, Dan Brewer <danqualman@...> wrote:
      >
      > > On of the problems with using POP is that it is hygroscopic meaning that
      > > the material will never release all of the water trapped in its
      > structure.
      > > It actually will draw water out of the atmosphere . I would use a
      > material
      > > that when fired will vitrify and change to a substance that now will
      > reject
      > > water. American plaster makes casting plaster. 50 lbs goes for about
      > > 20USD . There are several others. Plaster of Paris is best left to the
      > > art casting for statues.
      > >
      > > Dan in Auburn
      > >
      > >
      > > On Tue, Apr 9, 2013 at 10:07 PM, Eggleston Lance <wheezer606@...
      > >wrote:
      > >
      > >> **
      >
      > >>
      > >>
      > >> OK, will dry 400-700 F.
      > >>
      > >> Would it work better to fill from the bottom and
      > >> vent at the top ?
      > >>
      > >> lance
      > >> ++++
      > >>
      > >> On Apr 9, 2013, at 10:19 PM, Jeshua Lacock wrote:
      > >>
      > >>> Sounds like the POP had far too much water in it still.
      > >>>
      > >>> I would dry it out more around 400F. When I do lost plastic casting (a
      > >> bit different of course) I heat the POP mold up to around 1000F...
      > >>
      > >> [Non-text portions of this message have been removed]
      > >>
      > >>
      > >>
      > >
      > >
      > > [Non-text portions of this message have been removed]
      > >
      > >
      > >
      > > ------------------------------------
      >
      > >
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      >


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