Mold making for Bondo resin

  1. #1
    Dark Jedi's Avatar
    Member Since
    Feb 2004
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    Huntsville
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    Mold making for Bondo resin

    Im looking to make a mold to create a cast of a proton pack out of bondo resin and fiberglass. I was wondering if someone knows what type of mold material and release I should use that is compatible with the resin. Please share your input.

  2. #2
    mrbungle's Avatar
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    Oct 2008
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    Re: Mold making for Bondo resin

    did you sculpt and build the proton pack?

  3. #3
    Dark Jedi's Avatar
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    Feb 2004
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    Huntsville
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    Re: Mold making for Bondo resin

    I will. The pack will be made from wood and sealed properly so that I can make the mold for the fiberglass reproductions. I just need to know what materials to use to make the mold.

  4. #4
    Django's Avatar
    Member Since
    Jan 2009
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    Indian Territory (Oklahoma)
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    Re: Mold making for Bondo resin

    this might help.

    buy a shell and then reinforce it with fiberglass or another substance to make a mold?

    http://www.studiocreations.com/howto...ack/index.html

  5. #5
    Dark Jedi's Avatar
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    Feb 2004
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    Huntsville
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    Re: Mold making for Bondo resin

    Thanks for the help, but I think there is confusion in what I am asking.

    Origional will be built from wood and bondo to the correct shape. What I am planning to do is cast this in silicone or rubber to make a mold that will be used to make up to 4 fiberglass copies.

    What my question is is what type of silicone or rubber should I use that will release cleanly from bondo figerglass resin.

  6. #6
    Dougie Fett's Avatar
    Member Since
    Apr 2008
    From
    Carlow, Ireland
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    Re: Mold making for Bondo resin

    RTV rubber will do the job, it will not adhere to anything.

  7. #7
    Big_water99's Avatar
    Member Since
    Jan 2009
    From
    Orlando Fl
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    21

    Re: Mold making for Bondo resin

    Mold max 30 silicone is used alot I would just a make a all fiberglass mold myself as long as there arent to many under cuts it would work great

  8. #8

    Member Since
    Mar 2009
    From
    Shanghai, China
    Posts
    16

    Re: Mold making for Bondo resin

    Do u have pictures of this thing to be built? If its a one piece with nothing sticking out then u can make matrix molds. Its a bit complicated but you can build a mold that will give u quality casting without deformities and easy demolding of the hard piece.

    matrix molds involve making a simulated mold with keys and ribs using wed clay or klean clay and then spray a clear coat before you build the shell mold on top of this using plaster powder with burlap. There are a million ways to make a mold so it depends on what your object looks like. Whether it'll be a 1 piece mold or 2 part mold or multi-part mold. etc

    Mold release for casting resin has several options. U can use a spray that contains gas and silicone oils to maintain the rubber mold and allow for easy demolding. Also talcum powder is good, sprinkle a bunch into the rubber mold and brush off like dusting old furniture.

  9. #9

    Re: Mold making for Bondo resin

    In my experience with the bondo stuff, any of the smooth-on silicones will work fine, even without any mold release. As Uratz says, you can also use a light dusting of talcum powder, or a dedicated release agent like the ease release 200 that Smooth-on also sell.

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