<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=Content-Type content="text/html; =
charset=iso-8859-1">
<META content="MSHTML 6.00.2800.1400" name=GENERATOR>
<STYLE></STYLE>
</HEAD>
<BODY id=role_body style="FONT-SIZE: 10pt; COLOR: #000000; =
FONT-FAMILY: Arial"
bottomMargin=7 bgColor=#ffffff leftMargin=7 topMargin=7 =
rightMargin=7>
<DIV><FONT size=3>At the risk of sounding like I am of the opinion =
that there is
only one type of epoxy worthy of use on this planet, I offer the =
following for
your consideration.</FONT></DIV>
<DIV><FONT size=3></FONT> </DIV>
<DIV><FONT size=3>From my experience, the source of failure with =
epoxies in
general, when they occur, is between the epoxy and the substrate =
being
bonded - in a repair like a rim, it would be the epoxy-to-wood =
joint that
can be of concern. An epoxy bond is a mechanical bond: the epoxy must =
penetrate
the wood sufficiently so that after it hardens it will not work loose. =
You've
all heard/seen/experienced an auto-body repair with "Bondo" that =
separates from
the metal after some time. This is because a proper mechanical bond was =
not made
between the Bondo (yes, I know, Bondo is a polyurethane-based product - =
but the
analogy works) and the metal substrate. The same can happen =
with the
epoxy-to-wood joint.</FONT></DIV>
<DIV><FONT size=3></FONT> </DIV>
<DIV><FONT size=3>A thick, putty-like epoxy, simply does not penetrate =
a wooden
surface well on its own.</FONT> </DIV>
<DIV><FONT size=3></FONT> </DIV>
<DIV><FONT size=3>Now in a low-stress joint like filling a divot in a =
piece of
wood, the thick epoxy might work just fine. But be sure to moosh the =
epoxy into
the wood a bit to be sure it will interlock with the surface fibers of =
the
wood.</FONT></DIV>
<DIV><FONT size=3></FONT> </DIV>
<DIV><FONT size=3>In a high-stress joint, an epoxy like West System =
with its
various fillers really shines. The basic principal here is to wet =
wood
surfaces down with an unthickened epoxy - you can watch as the epoxy =
soaks into
the wood - if it soaks in fast, you may want to apply unthickened epoxy =
again -
with end grain you will want many applications of unthickened epoxy =
until it
doesn't take any more. Then you add your filler of choice and thicken it =
to
whatever consistency is appropriate for the application and make your =
bond.
Doing this "preparatory wetting of the surfaces" will yield an epoxy =
bond that
quite simply will never let go.</FONT></DIV>
<DIV> <BR><A href="http://www.farrellpiano.com" =
target=_blank><IMG
src="http://www.mymailsignature.com/fwpdata/f2/25/55/52/7CB43BC1-F2C7-4=
1C6-9528-56F753AD6856sig.png"
border=0></A> </DIV>
<DIV> </DIV>
<DIV>----- Original Message ----- </DIV>
<BLOCKQUOTE dir=ltr
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; =
BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: =
black"><B>From:</B>
<A title=Erwinspiano@aol.com
href="mailto:Erwinspiano@aol.com">Erwinspiano@aol.com</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A =
title=pianotech@ptg.org
href="mailto:pianotech@ptg.org">pianotech@ptg.org</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Sunday, July 11, 2004 =
6:02 PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: Lock tite- wood =
epoxy</DIV>
<DIV><BR></DIV><FONT id=role_document face=Arial color=#000000 =
size=2>
<DIV>
<DIV>In a message dated 7/11/2004 1:42:26 PM Pacific Standard Time, <A =
href="mailto:lclgcnp@yahoo.com">lclgcnp@yahoo.com</A> writes:</DIV>
<BLOCKQUOTE
style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue 2px =
solid"><FONT
style="BACKGROUND-COLOR: transparent" face=Arial color=#000000 =
size=2>I just
used some of this stuff, mixed with aniline dye<BR>powder, to =
replace a bit
of rim molding on a 1925<BR>grand I am working on. Worked pretty =
well. Hard
to see<BR>repair. I would, though, like to hear =
others'<BR>recommendations
for suc<STRONG>h repairs. I am inclined to try<BR>the "Tootsie =
Roll"(TM)
type epoxy putty, mixed with<BR>dye powder, next =
time.</STRONG><BR>
Thump</FONT></BLOCKQUOTE></DIV>
<DIV></DIV>
<DIV> Good idea. I've wanted =
to try
it myself.</DIV>
<DIV>
Dale<BR><BR><BR><BR><BR><BR><BR><BR><A
href="http://www.mymailsignature.com/?partner=ZGzeb001" =
target=_blank><IMG
src="http://www.mymailsignature.com/sig.jsp"
border=0></A></DIV></BLOCKQUOTE></FONT></BODY></HTML>