False Beats in high treble after stringing

[Farrell]

West System epoxy offers several different hardeners that have vastly different cure times. You can use these differing characteristics to great advantage in special situations. Like with the bridge pins, I use their Extra Slow hardener. They have fast hardener, regular and one for when using epoxy as a coating material.  http://www.westsystem.com/

The other day I epoxied nose bolts into a piano after I had already installed the board and plate (hey, at least I learned something). I had drilled the posts clear through. So I taped the soundboard side of the post where the bolt went through and poured in epoxy from rear (3/8" threaded rod in 1/2" hole). Real soon, the tape started to leak, and many four-letter words poured from my otherwise virgin lips. Fortunately I had used the fast hardener and within about 10 minutes it started to harden and stopped leaking through the tape - I was spared total disaster (epoxying soundboard to nose-bolt and plate).

Other times, like when laminating, you may wish to use the slower hardeners to give you maximum working time.

Terry Farrell
  
----- Original Message ----- 
From: "Ron Nossaman" <RNossaman@cox.net>
To: "Pianotech" <pianotech@ptg.org>
Sent: Tuesday, June 10, 2003 9:56 PM
Subject: Re: False Beats in high treble after stringing


> 
> >O.K. this is something I've been confused about for some time now. I 
> >thought that the chemical reaction between the two components of epoxy 
> >were what caused heat and therefore the curing or hardening process. If 
> >you heat with a hair drier or heat gun how does the epoxy thin and not 
> >harden? I believe you, I just don't know how this is possible. Is there a 
> >different way to mix the epoxy or a different product to buy?
> >
> >Greg
> 
> Heat thins the epoxy momentarily, but accelerates the cure rate too, so the 
> net effect is better penetration but a shorter working time. It can get 
> touchy, depending on your epoxy and mix proportions when you find that as 
> the stuff cools from your heat application, it goes from the viscosity of 
> water to that of tar - or stone. Best to experiment some with an unfamiliar 
> product to get acquainted with it's characteristics before committing in a 
> piano. If you ever need to know anything about epoxy, ask Terry.
> 
> Ron N
> 
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