Part stuck in mold!! Yikes!!

Discussion in 'Fiberglass and Composite Boat Building' started by searaytuna, Feb 28, 2006.

  1. searaytuna
    Joined: Oct 2005
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    Location: SoCal. USA

    searaytuna Junior Member

    Tried taking the part off of my mold all day today! Put 4 coats of mold release wax and it still wouldn't budge. It is in the shape of an L rotated 90 degrees counterclockwise. I was able to separate the vertical portions of it but the borizontal areas of the part is not budging. Is there a way to get the part out without carnivorizing the mold?? Thanks in advance for any help.
     
  2. Cornish Mark
    Joined: Dec 2005
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    Location: Porthleven Cornwall UK

    Cornish Mark Junior Member

    Hi
    there are 2 methods we used to use to release stuck mouldings, the first one is to drive wood wedges between the released parts of the mould then poor hot water in & time will tell wether it will let go.The other is to drill small holes through the mould hopefully stoping before damaging the moulding & glass on nipples suitable for connecting an air line, then blowing compressed air between the mould & moulding.
    Hope this is of some help Regards Mark
     
  3. wet feet
    Joined: Nov 2004
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    Location: East Anglia,England

    wet feet Senior Member

    Two further questions:first one being do you need to make another part from the mould?Seondly,is the mould in one piece?
     
  4. searaytuna
    Joined: Oct 2005
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    Location: SoCal. USA

    searaytuna Junior Member

    Welp. THanks for the replys guys. Yes. the mold is(was) in one piece. I was trying my best to salvage it for few more parts. After today, I don't think I will be making anymore parts off of it as I broke the molde in about a half a dozen places :mad: I initially started with a mid-sagital section of the mold very carefully trying to make sure I have a satraight line and all.. Long story short: the end result came out to be a few additional torn sections where the mold stuck to some corners where it had been filled with cabosil. Bad day today.
     
  5. antonfourie
    Joined: Oct 2005
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    antonfourie Senior Member

    You can always use the part that you have as a plug for a new mould ....
     

  6. Buckle
    Joined: May 2004
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    Location: Plymouth, UK

    Buckle Composite Engineer

    in future consider the use of chemical or water base sealers and monocoats, with wax as a an intial form of protection.

    We have two very successful release coat systems in production.

    U need to taylor ur release coat system to ur process. A tried and tested system which may work for one particular gelcoat and tooling system may not work on another. For example, a slight change from a polyester gelcoat to a vinylester gelcoat will require a much more durable release agent system, as vinylesters are much more aggresive.

    Have u recently changed ur process?
     
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