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40807Re: cement sand mold

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  • David
    Jan 8, 2011
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      Ernie
      just out of couriosity how big is that surface plate that you poured, it looks to have a pretty large surface area

      David

      --- In hobbicast@yahoogroups.com, "ferrman1001" <ferrman1001@...> wrote:
      >
      > Timing is important but water content can be flexible because excess water can be dried out. It does need a certain amount of water for the cement to set. For cores they should be set just enough to handled, so when the metal has frozen the core can be removed with ease. I like to call cement sand molds "the poor mans resin sand" because it is so cheap to use. Quick setting cements can be used but can be expensive
      >
      > Ernie
      >
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