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 > > _______________________________________________ > pianotech list info: https://www.moypiano.com/resources/#archives
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