resorcinol-wood flour for space-filling?

Discussion in 'Boatbuilding' started by sprit, Mar 18, 2015.

  1. sprit
    Joined: Jul 2013
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    sprit Junior Member

    Has anyone ever:idea: experimented with resorcinol glue, thickened with wood flour, for making space-filling joints?
     
  2. tom28571
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    tom28571 Senior Member

    What would be the reason to do that? Resorcinol is expensive and not widely available these days. It is completely waterproof and a great glue but has not been recommended for loose fitting joints and broad environmental conditions. It has short shelf life as well. Seems to me that you are talking about using Resorcinol in applications it is least suited for.

    There is a European glue that may be similar. http://www.svb24.com/en/bindan-cin-glue-and-hardener.html New glues seem to be introduced on a monthly basis. The two that I depend on are epoxy and PVA Titebond for almost all needs..
     
  3. PAR
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    PAR Yacht Designer/Builder

    Resorcinol doesn't accept filler materials very well and it ruins the bond. I tested doing this a few decades ago and had terrible results with all the various test subjects employing numerous filler materials.

    For gap filling properties, the hands down choice is epoxy.
     
  4. sprit
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    sprit Junior Member

    PAR: Thank you, that is just what I wanted to know (and expected).

    tom28571: Your statement that "I am talking about using resorcinol in applications it is least suited for" is insulting. I didn't mention any applications. In fact I was thinking about people with serious epoxy allergies who need an excellent glue. I also think that more builders would use resorcinol for boats designed for hot, wet tropical conditions, if adding a little filler to resorcinol would allow less tightly fitting joints. PAR has made it clear that this is not an option.
     
  5. gonzo
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    gonzo Senior Member

    If you are allergic to epoxy, resorcinol will put you in the hospital. It is really much more toxic. I have used wood flour and resorcinol to fill holes, but they were not structural; just cosmetic.
     
  6. tom28571
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    tom28571 Senior Member

    Spirit,

    Are you contending that your above request does not contain a direct reference to an application "thickened with wood flour, for making space-filling joints". I certainly intended no insult to you and was just offering a reply to your question.

    Now, I find you reply not only insulting but also wrong.
     
  7. PAR
    Joined: Nov 2003
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    PAR Yacht Designer/Builder

    Agreed, it seems Spirit has misinterpreted Tom's reply, which is an easy thing to do in an environment like this. I found Tom's reply, plain and simple, which is generally good.

    Resorcinol requires fairly strict adherence to environmental conditions, very well matched joints and a reasonably fresh batch, other wise poor results will occur. It was the glue of choice for many decades, but with epoxy, it's relegated to other tasks.

    Most folks with epoxy sensitivity, can mitigate it to a degree with some research. Most have issue with the glycol groups in amine activated formulations, so switching to a non-amine formulation can eliminate or greatly reduce reactions. Of course exposure can be reduced with prep and protection as well. Of all the epoxy sensitive builders I know, all but one openly admits they use to swim in the stuff earlier in their career. Kind of hard to blame the epoxy for this, but once you're sensitive, you need to make changes and prep, protection and formulation are the keys.
     
  8. hump101
    Joined: Oct 2004
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    hump101 Senior Member

    We've done a lot of work with resorcinol, I like it as a glue, but as PAR noted, it is too brittle to be used as a gap filler, and any additive will exacerbate this characteristic. Clean non-oily wood, good joint, well clamped, it still has applications, but in many applications it is better to have a gap filled with a flexibilsed adhesive (typically epoxy but there are others) which will result in better fatigue and impact resistance.
     
  9. Easy Rider
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    Easy Rider Senior Member

    I built a 28' plywood boat using resorcinol glue. It was ultralight and I drove her into big seas many times. Never even leaked untill she was on dry land for several years.
     
  10. PAR
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    PAR Yacht Designer/Builder

    Resorcinol had its day and still has some uses, but given epoxy and other adhesives, it's now the redheaded step child it once wasn't.
     
  11. Marmoset
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    Marmoset Senior Member

    Off topic but! I wonder if they still use it for adhering teeth?




    Barry
     
  12. PAR
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    PAR Yacht Designer/Builder

    Only in the SF bay area . . .
     
  13. Marmoset
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    Marmoset Senior Member

    Lol!!! That response caught me off guard enough I snorted out loud in a Wendy's!

    Barry
     

  14. PAR
    Joined: Nov 2003
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    PAR Yacht Designer/Builder

    As long as it doesn't come out your nose, you're good to go . . .
     
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