Hair spray as mold release

Discussion in 'Boat and Accessory Building' started by JohnAbercrombie, Oct 16, 2019.

  1. JohnAbercrombie

    JohnAbercrombie Paddler

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    On my 'to-Do' list for this week was fabricating a new glass/carbon/epoxy seat for my next kayak project (Bjorn Thomasson Njord).
    Just a few days ago, I'd read (online) an article from 'Epoxyworks' - the WEST newsletter - about using hair spray in lieu of PVA mold release. No need to get out my (cheap) spray gun to mist the PVA on to the waxed mold, no gun cleanup, and the hair spray (Pantene Extra Hold ! :) ) was on sale at my local drugstore. Aerosol can so it sprayed very nicely.

    It didn't work nearly as well as PVA. I got the seat off the mold but it was more of a struggle than usual, and I think it was the wax that was doing the mold release job, not the hair spray. Part of the mold - a small spot of gelcoat - pulled away with the seat, so now that must be repaired.

    So, definitely not a technique I'll use again.

    My shop does smell nice, though! :)

    Here's the link to the Epoxyworks article:
    https://www.epoxyworks.com/index.php/mold-release-pva-and-hairspray/
     
    Last edited: Oct 16, 2019
  2. Astoriadave

    Astoriadave Paddler

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    That Epoxyworks article is dated 1999, I believe. Might be that hair spray products no longer use PVA.
     
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  3. JohnAbercrombie

    JohnAbercrombie Paddler

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    Good point - I didn't think of that.
     
  4. mick_allen

    mick_allen Paddler & Moderator

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    Maybe there's a better release if you haircut the mould first.
    Less itchy, too.
     
  5. JohnAbercrombie

    JohnAbercrombie Paddler

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    I was going for the bouffant look....
     
  6. Roy222

    Roy222 Paddler

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    I watched some pros once a long time ago.
    They simply drilled some small holes in the mold and uses compresses air. The part just popped out of the.
    It was big part - a truck cab.
     
  7. JohnAbercrombie

    JohnAbercrombie Paddler

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    I've heard of that, too.
    But, I think we can be sure that the mold for that truck cab was polished to a very high shine and had multiple coats of mold wax on it. And, probably a mist coat of PVA?