mould sealer?

Discussion in 'Fiberglass and Composite Boat Building' started by nevilleh, Oct 10, 2010.

  1. nevilleh
    Joined: Sep 2008
    Posts: 73
    Likes: 2, Points: 0, Legacy Rep: 53
    Location: scotland

    nevilleh Junior Member

    All these question guys !

    Is it worth puting mould sealer on my plug?

    Ive only used it once and i didnt think it made much difference.

    I have had problems before with the duratec sticking to the mould surface - i think it saps up the wax, so i was thinking the sealer may be the way to go for this .

    Ive pretty much ruled PVA out - im sure I will be corrected though . I just cant see the point of getting a fantastic shine with the wax only to cloud it over with the PVA ?

    Unless I should be reworking the new mould afterwards ? :(
     
  2. patiras
    Joined: Jan 2007
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    Location: France

    patiras Junior Member

    I've had problems with just wax on duratec. I use TR 910 and 900 on duratec. No need to get it beyond about 1000 grit on the plug; the mould polishes up dead quick.

    Al.
     
  3. Herman
    Joined: Oct 2004
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    Location: The Netherlands

    Herman Senior Member

    A mould sealer is your insurance. Get a well proven system that you are comfortable with, and that can be used in your circumstances. Do a test piece to see if the release is what you expect from it.

    I see Zyvax products used, but also Ferro FS10, even just using their sealer, and putting Meguiar M87 on top.

    I also see no point in using PVA, but for very bad moulds. I even made a polyester mould from a boat that was sanded with 220 grit. No shine, however...
     
  4. nevilleh
    Joined: Sep 2008
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    Location: scotland

    nevilleh Junior Member

    yes, i think that is key - a test piece. thanks.
     
  5. jim lee
    Joined: Feb 2007
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    Location: Anacortes, WA

    jim lee Senior Member

    Tend to disagree. We've had good luck wiping a thin coat of PVA on our plugs before making molds from them. Side by side tests, PVA released and without, the plugs came out in chunks.

    -jim lee
     

  6. Herman
    Joined: Oct 2004
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    Likes: 89, Points: 48, Legacy Rep: 1240
    Location: The Netherlands

    Herman Senior Member

    My biggest problem with mold release is a too good release. If your plugs come out in chunks, something is definately wrong. I do have some suspicions, but that is for another thread.
     
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