replacing back catch leathers.

[Isaac OLEG SIMANOT]

Hello,

I remember I've seen in the Journal reprints something about hot hide glue,
where the important thing was not to cook it too high temperature, that any
temp higher than 75°c (sorry I may check to see in F°) , will be bad for the
glue.
Afterthat (after initial cooking) the use temperature would be around 65°c

Personally I take a mix from pearls of nerve glue (for hardness) and pearls
of skeleton glue (sorry don't found the word). Depending of the job I mix
1/3 2/3, or less, I add some urea sometime (5%weight), but once added, the
glue can't be cold them warmed again. If no urea one can use some urine as
it was done in the shop at the last century (never done that actually !)
This to slow the gelling time.

The glue is well moisten after a night, but 4 hours is well enough, and if
in a hurry, you can add hot water on the pearls .

What I use if I want to keep the glue for some days, is a conservative agent
used in paint restoration, just use a little and I don't have mushrooms on
my glue.

I use it for many things, but I discover recently the Caurit glue for
hanging hammers, and I like the time it allows for work, plus expanding
possibilities. I am willing to glue a full hammer head in less than 1 hour
 + tails shaping). Now it is almost twice ...

Regards.

Good hot glue

Isaac










> -----Message d'origine-----
> De : owner-pianotech@ptg.org [mailto:owner-pianotech@ptg.org]De la part
> de Newton Hunt
> Envoyé : mardi 30 octobre 2001 16:39
> À : pianotech@ptg.org
> Objet : Re: replacing back catch leathers.
>
>
> > and #3 is using hot hide glue.
>
> Using hot hide glue is no more complex than scrambling eggs.  Even _I_
> can do that.
>
> 1.  Break eggs ...  Opps, wrong recipe.
>
> 2.  Get a small jar, baby food jars are great.
> 2.  Pour about 3/8" of glue into the jar (take lid off first).
> 3.  Slowly dribble water into the jar until the glue is just covered.
> 4.  Set aside overnight.
> 5.  Next morning put water, about 1", into your pot and plug it in.
> 6.  When it is hot take the glue to the microwave and knucke it for
>       15 seconds.
> 7.  Stir it and put it in the pot.  Leave for about two minutes or so.
> 8.  Stir again.  When it is all dissolved add water or more glue to
>       get the consistency you want.
> 9.  Stick a hammer shank in the glue and lift out.  Two or three
>       drops should fall off the stick.  That is about right until you
>       get a real feel for the stuff.
> 10. Use it.
>
> Dry fit everything then spread thin and work immediately but not
> necessarily fast.  When the glue jells it is a little late.  It will
> jell, based upon thickness, in about five to ten seconds.  You have time
> to work with it but not time to doddle or be indecisive.
>
> Maple syrup, the real stuff, is too thin, honey is too thick.  Thin
> spread is better, clamps, wedges, cauls, or hand pressure immediately.
> It jells, then sets within a few seconds but takes 24 hours to cure.
> Leave it clamped tjhe 24 hours, as you would with Titebond or other
> glues.
>
> Keep wet paper towels or a wet rag at your side to clean your fingers or
> tools when you get some on those items.
>
> This is not rocket science, after all, this stuff has been in use for
> centuries and centuries.
>
> Now, who has a video camera...?
>
> 		Newton
>