release agentSubscribe
  1. formerly LOPERO Scoutleader's Avatar
    Member Since
    Aug 2006
    Sep 5, 2007, 11:40 PM - release agent #1

    Is there a "homemade" or "poor mans"release agent I can use to make molds of plastic parts in plaster of paris?

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  3. tubachris85x's Avatar
    Member Since
    Mar 2006
    Sep 5, 2007, 11:47 PM - Re: release agent #2

    Well according to the thurston james book of mold making and casting, dosnt say exactly for making a plaster mold from plastic, but casting in materials of polyurethane plastics, you can use lacquer, PVA, talc, and wax. Hope this helps.

  4. formerly LOPERO Scoutleader's Avatar
    Member Since
    Aug 2006
    Sep 6, 2007, 12:00 AM - Re: release agent #3

    Yes it does
    Thank you
  5. Member Since
    Jul 2003
    Sep 6, 2007, 10:59 AM - Re: release agent #4

    I would use vaseline, I have made many molds from plaster and used it without any problems.

    I make the plaster mold, then coat the inside with a thinned down layer of plaster to fill in any bubble holes, then lightly apply the vasoline, and never had any thing stick when making the cast.

    Vaseline is in the same catagory as duct tape, it has thousands of uses.
  6. Sep 6, 2007, 8:57 PM - Re: release agent #5

    I've used Vaseline as mold release and also used PAM nonstick spray.
    Depends on what your doing. Plaster doesn't really stick to some plastics so you might not even need it but better to be safe than sorry.
    hope this helps.
  7. Fetthunter's Avatar
    Member Since
    Jun 2002
    Sep 10, 2007, 3:16 PM - Re: release agent #6

    Vaseline will work on plaster.

    I use SmoothOn's mold release spray with my Urethane/Silicone work.

    Mike, are you molding mini helmets for those slides?

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