Mold making (Liquid latex and foam core)

Discussion in 'Replica Props' started by Buch, Mar 13, 2015.

  1. Buch

    Buch Sr Member

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    Hi guys

    I wanna make some resin replicas of some custom prop parts that I build in foam core...

    Can I pour liquid latex directly on the foam core parts and make a mold that way? Or will the liquid latex stick to the foam core?
     
  2. cavx

    cavx Master Member RPF PREMIUM MEMBER

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    Use silicone, not latex to make a mold. Silicone only sticks to itself, not sure about latex. There are different types of silicone and you need to do some research on them to save yourself grief later on.

    How complex are the parts you want to make a mold of? You may also need to read up how to make a two part mold.
     
  3. Buch

    Buch Sr Member

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    The parts are pretty simpel... Like a 5 by 3 inch picture frame. Will look for some silicone instead...

    I think I could do the parts by simply placing them on the bottom of a shallow container and then pouring silicone over... That will make the negative.

    Had some liquid latex in stock, used it to make different molds on different materials... Perhaps I should just do a test on the foam core....
     
  4. ash123uk

    ash123uk Active Member

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    the liquid latex will soak into the foam and become part of it.

    you need to use silicone and possible some kind of release.

    If you are going to pour the silicone over the frame you will need to seal the edges of the frame to prevent the silicone going underneath the frame and completely encasing it.
     
  5. Buch

    Buch Sr Member

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    Precisely what I was fearing... Thanks for the advice! Will find some silicone and release instead :)
     
  6. ash123uk

    ash123uk Active Member

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    Last edited by a moderator: Nov 8, 2018
  7. Buch

    Buch Sr Member

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    Wow - what at great idea! Thanks for sharing :)
     
  8. Duncanator

    Duncanator Sr Member

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    This may seem obvious; but before you pour the silicone over your part, make sure it is glued down or else it may float to the surface. It is less dense than the silicone.
     
  9. Buch

    Buch Sr Member

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    Still pretty new to this business... So thanks for mentioning :thumbsup
     

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