Casting powder still wet...

Discussion in 'Replica Props' started by Reiku85, Aug 7, 2015.

  1. Reiku85

    Reiku85 New Member

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    Quick question...

    I'm making a prop knife with the intention of making a mould and casting it. The master was made using a block of casting powder set in the vague shape, then carved into the form of the blade.

    Issue is the newly-carved surface doesn't feel set! Instructions quoted a 20 minute set time and I left it a good few hours before I started carving, but it's still clammy to the touch. Is this normal or have I screwed up? I'm concerned that I perhaps put too much water in the mix...

    Any advice is greatly appreciated!!
     
  2. dday

    dday Sr Member RPF PREMIUM MEMBER

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    Potentially it wasn't mixed right, and it wasn't able to fully set. You can start again or cost it again with something like bondo to get a solid surface.
     

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