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Thread: What won't stick to Epoxy?

  1. #1
    Awesome User Title Diode-Man's Avatar
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    Question What won't stick to Epoxy?

    Hey, I'm working on a mold for an invention of mine, I require something that can be sprayed or painted that won't stick to epoxy. I tried polyurethane and the epoxy sticks to it. (or even something that can be assembled for a crude mold, where the material itself won't stick to epoxy)

    Anything I can buy at the hardware store that will work as a mold release?

    (besides: "Mold Release, Parting Agent for Epoxy Resin" since I don't want to wait forever on shipping)

  2. #2
    had a mod but let him go spidergoat's Avatar
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    Saran wrap, or plastic wrap. Waxed paper. Furniture paste wax. Vaseline (petroleum jelly). Thin vaseline with naptha and it will become paintable, let the naptha evaporate.

  3. #3
    Awesome User Title Diode-Man's Avatar
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    Ahh, thanks for the info

  4. #4
    had a mod but let him go spidergoat's Avatar
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    Yup, I've made lots of molds.

  5. #5
    Awesome User Title Diode-Man's Avatar
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    Quote Originally Posted by spidergoat View Post
    Saran wrap, or plastic wrap. Waxed paper. Furniture paste wax. Vaseline (petroleum jelly). Thin vaseline with naptha and it will become paintable, let the naptha evaporate.
    This is becoming quite discouraging. I've tried it with plastic wrap, Vaseline and tin foil. None of them worked... Since I'm going to be making a mold that has to last through a bunch of uses, I don't think waxed paper would do the job. The epoxy seams to break down the Vaseline so that it just absorbs into my mix.

    I would try motor oil, but that would be a major pain to remove after the epoxy hardens...

    The epoxy also breaks down craft hot glue. RRRrrrr!!

    Any other suggestions?

  6. #6
    Caput gerat lupinum GeoffP's Avatar
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    Hmm. Try your skin. Start with something non-vital like your gonads, though.

  7. #7
    acording to wikipedia it doesnt look like there is a substance it wont stick to.

    seems your best bet would be to soak your mold in vingar before using it but that might destroy the epoxy compleatly

  8. #8
    PTFE plastic should work. I have done a lot of candle bases etc. from kits that use some type of plastic as the mold pattern. They work very well.

  9. #9
    Awesome User Title Diode-Man's Avatar
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    Ahh... the space age glue is good... almost too good!

    Thanks for the input everyone

  10. #10
    had a mod but let him go spidergoat's Avatar
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    Read my PM, Diode-Man. There are things epoxy will not stick to, but it depends on several factors. Some mold materials like silicone don't require much, if any mold release for most materials (besides other silicone).

    Heat is a factor. Trying to cast in thick sections is a bad practice with epoxy, for large parts, you are better off with polyurethane resins. Thick sections will generate tremendous heat, enough to melt some mold materials, and make release agenst useless. Using epoxy just to impregnate fiberglass cloth generates little heat.

    There is also another factor, the texture of the material you are trying to protect. It's possible to acheive a mechnical bond, even if there is no chemical bond.
    Last edited by spidergoat; 07-20-08 at 12:50 PM.

  11. #11
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    Quote Originally Posted by Diode-Man View Post
    Ahh... the space age glue is good... almost too good!

    Thanks for the input everyone
    If you have a good casting plastic that recommends a particular mold-release material, it looks like at this rate you're going to end up waiting for the mold-release whether you want to or not. Good luck with that.

  12. #12
    Registered Senior Member
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    Have you tried silicone spray lubricant?

  13. #13
    Caput gerat lupinum GeoffP's Avatar
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    Are you trying to get loose from a road sign? Be honest.

  14. #14
    Valued Senior Member Facial's Avatar
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    Greased, plastic shopping bags.

  15. #15
    Awesome User Title Diode-Man's Avatar
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    hmmm.... with all this information I cannot fail! Once my product is complete I'll post a photo on here and you people can buy it if you are into night time longboarding.... *hint*


  16. #16
    Caput gerat lupinum GeoffP's Avatar
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    I'm only into nighttime waterboarding, sorry.

  17. #17
    Awesome User Title Diode-Man's Avatar
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    Quote Originally Posted by GeoffP View Post
    I'm only into nighttime waterboarding, sorry.
    waterboarding at night? Is that even safe dude?

    Hmmm.... lights on a surfboard? I would like that, but its not safe.... is it?

  18. #18
    Caput gerat lupinum GeoffP's Avatar
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    Actually I do most of my waterboarding in sandy places. Trust me, it's plenty safe.

    Well, for me.

  19. #19
    What about that special type of plastic you have in... things like those dolls they used to make called ''Stretch-Armstrongs?''

    In other words, i have no idea

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