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  1. RPF Premium Member Skaught's Avatar
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    St. Pete
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    Nov 10, 2010, 2:34 PM - Alternatives for Mold Release Agents #1

    Is there any commong item that can be used as a mold release agent for a silicone mold? I know vaseline can be used, but last time I did that it left brush strokes in the final piece. What about non-stick cooking spray?

    Scott
  2. Wolvster1's Avatar
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    Nov 10, 2010, 2:39 PM - Re: Alternatives for Mold Release Agents #2

    Lord, don't tell me you brushed in vas ALONE into
    a mold... Eww what a mess that would make...

    Next time mix it with NAPHTA and paint the
    molds with it. All the release agent you'll need...
  3. Raffles's Avatar
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    Jun 2006
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    Scotland U.K.
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    Nov 10, 2010, 2:39 PM - Re: Alternatives for Mold Release Agents #3

    Furniture/beeswax is good.
  4. Contec's Avatar
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    Sweden
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    Nov 10, 2010, 2:40 PM - Re: Alternatives for Mold Release Agents #4

    you could try heating up the vaseline a little bit before you brush it on.
  5. Finhead is offline Finhead
    Nov 10, 2010, 2:42 PM - Re: Alternatives for Mold Release Agents #5

    Silicone mold. None, IMO it causes more trouble than help.
  6. Etewaf's Avatar
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    Jun 2010
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    Nov 10, 2010, 2:42 PM - Re: Alternatives for Mold Release Agents #6

    I've never actually put mold release -on- the piece that was being molded. I usually brush Vicks vapo-rub (essentially vaseline) on the silicon around the piece that way the next half of the mold doesn't stick to itself. If any gets on the piece, I wipe it off with a cotton swab. Out of curiosity, what are you trying to mold?
  7. skynet's Avatar
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    Jan 2009
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    austria
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    Nov 10, 2010, 3:19 PM - Re: Alternatives for Mold Release Agents #7

    Try Epoxy Parfilm works great.

    http://www.price-driscoll.com/parfilm.html
  8. CaptCBoard is offline CaptCBoard
    Nov 10, 2010, 8:30 PM - Re: Alternatives for Mold Release Agents #8

    No mold release is needed for silicone rubber. If you are asking about a release when making a multiple part mold, so rubber doesn't stick to rubber, vaseline is the stuff. Use a wide, flat brush to apply the vaseline so it is just a film, no streaks. Do this just before you pour the rubber or the vaseline will dry out.

    The reason using a mold release is useless is that nothing sticks to silicone rubber. You can put a layer of spray paint in a mold and then pour the material and you'll see the paint pulls loose by how the paint appears on the casting.

    Scott
  9. RPF Premium Member Skaught's Avatar
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    Nov 10, 2010, 11:04 PM - Re: Alternatives for Mold Release Agents #9

    I'm pouring the silicone over plastic mainly, and it will hit some clay and a wood box frame. I didn't think I really needed it, but all the demo videos show it being used.

    Scott
  10. JtotheP's Avatar
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    Jun 2008
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    Apopka, FL
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    Nov 10, 2010, 11:42 PM - Re: Alternatives for Mold Release Agents #10

    As long as the clay isn't sulfer based so it won't react with the silicone you should be fine. I've used Smooth-On's Universal mold release spray.
  11. MattMunson's Avatar
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    Nov 11, 2010, 12:43 AM - Re: Alternatives for Mold Release Agents #11

    The bummer with the brush on stuff, as per the OP, is that it can leave brush marks and pool up in nooks and crannies. I JUST wrote a blog entry related to this topic and recommended this stuff:

    Ease Release® 200 | Silicone Rubber, Urethane Rubber, Liquid Plastic, Casting Resin, Lifecasting, Epoxy Resin, Rigid and Flexible Foam from Smooth-On

    It's basically a spray on vaseline. Works really well, and conforms PERFECTLY to the shape of whatever you're spraying on. So no brush marks, not bristles, no pooling.

    Here's the blog entry if you want more details:
    The Project Work Bench: Reader Mailbag
  12. RPF Premium Member Skaught's Avatar
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    Nov 11, 2010, 12:58 PM - Re: Alternatives for Mold Release Agents #12

    Thanks guys. My Mold Max arrived today so hopefully I can get started this weekend.

    Scott
  13. Thermalized Plastics's Avatar
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    Nov 2001
    From
    A little town far far away.
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    414
    Nov 11, 2010, 3:26 PM - Re: Alternatives for Mold Release Agents #13

    Skaught said: View Post
    Thanks guys. My Mold Max arrived today so hopefully I can get started this weekend.

    Scott

    You can use Vaseline,... Just use a hair dryer on low setting. This gets in to all the little corners and edges! Plus NO streaks!


    thermal
  14. Member Since
    Jan 2009
    Messages
    139
    Sep 7, 2013, 4:39 AM - Re: Alternatives for Mold Release Agents #14

    Sorry for the necro-post guys, but I have a related question and I can't seem to find info anywhere else. I have a plastic form that I want to pour urethane foam into (Smooth-On Foam It 10 slow). Can I use vaseline as a release agent on the plastic? Note: I'm not really concerned with brush strokes showing up in the pull. Any help would be greatly appreciated, thanks!
  15. RPF Premium Member razorsharp192's Avatar
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    UK
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    Sep 7, 2013, 5:32 AM - Re: Alternatives for Mold Release Agents #15

    spray wax mould release?
  16. Member Since
    Jan 2009
    Messages
    139
    Sep 8, 2013, 1:37 AM - Re: Alternatives for Mold Release Agents #16

    Hmmm, interesting. Never even thought of that. Thanks!
  17. loly2kn2's Avatar
    Member Since
    Jun 2009
    From
    Essex, UK
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    Sep 8, 2013, 5:32 AM - Re: Alternatives for Mold Release Agents #17

    Vaseline should work fine. It gives a good barrier but will leave brush marks, if you aren't bothered by that then go right ahead!
  18. Member Since
    Jan 2009
    Messages
    139
    Sep 9, 2013, 2:16 AM - Re: Alternatives for Mold Release Agents #18

    So I tried the vaseline and it worked ok...one small section bonded pretty fiercely and stayed on the plastic...it should be noted though that I only used a VERY thin layer of it. I'm thinking of having another go at it, but with a thicker layer. One thing I did want to share that I noticed is that due to the heat (I believe) from the curing process, it 'melted' the vaseline, cause that surface came out super smooth. I was very pleased with the results.
  19. Beaker's Avatar
    Member Since
    Apr 2010
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    Sep 9, 2013, 10:11 AM - Re: Alternatives for Mold Release Agents #19

    One cautionary tale on Vaseline... it is a petroleum-based product, silicones are petroleum-based products, which means they like to absorb more petroleum into themselves which can equal swelling or poor tear strength over time! Just an FYI
  20. Member Since
    Jun 2010
    From
    Dundee
    Messages
    58
    Sep 9, 2013, 1:08 PM - Re: Alternatives for Mold Release Agents #20

    has anyone used PTFE silicon spray as a release agent?
  21. Member Since
    Jan 2009
    Messages
    139
    Sep 10, 2013, 2:03 AM - Re: Alternatives for Mold Release Agents #21

    What about sonite wax from smooth-on? Would that work? Is it also silicone based?
  22. Beaker's Avatar
    Member Since
    Apr 2010
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    135
    Sep 10, 2013, 7:44 AM - Re: Alternatives for Mold Release Agents #22

    Sonite wax is 'ok'... still prefer either the Ease Release 200 or Ease Release 205 (the liquid version of ER 200) or the recipe 2 parts 99% isopropyl alcohol to 1 part plain blue Dawn dish soap...

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