[TheForge] OT - vinegar vs. epoxy

[Andy Gladish]

ok, that's kind of cool.
Epoxy has been very much on my mind lately- searching for the best adhesive 
for scale handles on full tang knives, still not completely satisfied with 
Devcon

--------------------------------------------------
From: "Jason Nass" <me at wargoth.com>
Sent: Sunday, August 22, 2010 7:28 PM
To: "'Blacksmithing List Sponsored by ABANA'" <theforge at mailman.qth.net>
Subject: Re: [TheForge] OT - vinegar vs. epoxy

> Filed away with all the other semi-useless scraps of knowledge that I may
> very well have use for some day...
>
> Seriously though, I can see occasional application of that quirk of epoxy,
> as I do a fair bit of molding and casting in various epoxy resins.
>
> Jason Nass - me at wargoth.com
>
> -----Original Message-----
> From: theforge-bounces at mailman.qth.net
> [mailto:theforge-bounces at mailman.qth.net] On Behalf Of Bruce Freeman
> Sent: Sunday, August 22, 2010 9:37 PM
> To: Blacksmithing List Sponsored by ABANA
> Subject: [TheForge] OT - vinegar vs. epoxy
>
> Way OT.
>
> The following quotation is from an article on using seat belt strapping as
> the hinge for a small boat rudder.
>
> The interesting part is on the chemistry of epoxy -- i.e., that you can
> prevent epoxy from setting using vinegar.  I haven't tried this myself and
> am not sure where it would prove useful.  I suspect any acid would work
> here, since acids protonate amines and change their chemistry, but I'm not
> sure that that's the chemistry involved.
>
>
> "...you must not allow the epoxy to harden on the strap where it has to
> flex. But the ends of the strap have to be well saturated to hold the 
> slide
> and the rudderstock halves together. The most successful way I've used to
> avoid glue where I don't want it is to get the parts all glued up and
> assembled with clamps, keeping the glue off the flex line as much as
> possible. Then use a syringe or squirt bottle to saturate the flex line 
> with
> vinegar, working it through the fibers, before the glue starts to set. The
> acetic acid neutralizes the amines in the epoxy hardener, so it won't
> polymerize. The clamped parts won't allow the vinegar to reach the glue on
> the strapping between them, so it goes off where you want it to." "
>
> --
> Bruce
> NJ
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