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  1. Dark Jedi's Avatar
    Member Since
    Feb 2004
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    811
    Apr 20, 2009, 7:17 AM - Mold making for Bondo resin #1

    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. mrbungle's Avatar
    Member Since
    Oct 2008
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    568
    Apr 20, 2009, 11:24 AM - Re: Mold making for Bondo resin #2

    did you sculpt and build the proton pack?
  3. Dark Jedi's Avatar
    Member Since
    Feb 2004
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    811
    Apr 20, 2009, 8:46 PM - Re: Mold making for Bondo resin #3

    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. Django's Avatar
    Member Since
    Jan 2009
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    102
    Apr 24, 2009, 10:46 AM - Re: Mold making for Bondo resin #4

    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. Dark Jedi's Avatar
    Member Since
    Feb 2004
    Posts
    811
    Apr 24, 2009, 11:15 AM - Re: Mold making for Bondo resin #5

    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. Dougie Fett's Avatar
    Member Since
    Apr 2008
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    295
    Apr 24, 2009, 12:53 PM - Re: Mold making for Bondo resin #6

    RTV rubber will do the job, it will not adhere to anything.
  7. Big_water99's Avatar
    Member Since
    Jan 2009
    Posts
    21
    Apr 24, 2009, 3:15 PM - Re: Mold making for Bondo resin #7

    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. Member Since
    Mar 2009
    Posts
    16
    May 31, 2009, 6:23 AM - Re: Mold making for Bondo resin #8

    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. Member Since
    Dec 2008
    Posts
    17
    May 31, 2009, 9:04 PM - Re: Mold making for Bondo resin #9

    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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