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<HTML><HEAD><TITLE>Re: Short Treble (sustain?)</TITLE>
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<DIV><FONT face=Arial size=3>I have long wondered about bridge cap =
finishes. I
have been omitting the black goop, but I have also been leaving the cap
completely unfinished. Not saying that's the best thing. I can certainly =
see
that a solid cap could benefit from some sort of coating protection, but =
I
wonder in the case of a horizontally laminated (epoxy) bridge cap, =
isn't
the bridge fairly well protected by the five layers of epoxy (is =
shellac or
polyurethane going to provide much additional benefit)?</FONT></DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial>Terry Farrell</FONT></DIV>
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<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: =
black"><B>From:</B>
<A title=sec@overspianos.com.au =
href="mailto:sec@overspianos.com.au">Overs
Pianos</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A =
title=pianotech@ptg.org
href="mailto:pianotech@ptg.org">Pianotech</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Saturday, November 01, =
2003 7:45
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: Short Treble
(sustain?)</DIV>
<DIV><BR></DIV>
<BLOCKQUOTE cite="" type="cite">
<BLOCKQUOTE><FONT face="Times New Roman"
=
color=#000040> Varnish is=
to
soft to be a bridge coating IMHO even if it went on first
& graphite doesn't do much to protect a bridge topeither. =
I've
been apllying several coats of shellac to<U> NEW</U> bridge tops. =
It seals
it nicely and it's hard when dry. It also allows the beauty =
of the
nicely quartered maple to come thru. I sand it smooth with fine =
paper then
polish it with a rag. Now obviously this is done before the =
pins
& strings go on. Right?</FONT></BLOCKQUOTE></BLOCKQUOTE>
<BLOCKQUOTE cite="" type="cite"><FONT face="Times New Roman"
color=#000040> Dale</FONT></BLOCKQUOTE>
<DIV>Dale and<FONT face=Arial> Stéphane</FONT>,</DIV>
<DIV><BR></DIV>
<DIV>I agree with your approach Dale. Similarly, I believe it is =
critically
important that the bridge is envelope-sealed and that the chosen =
material
should have a minimum of hysteresis loss. We currently use a =
polyurethane
sealer which is quite a brittle material<FONT color=#0000ff> (we =
cover the
sound board & cutoff panel, bridges and the action-bay in one =
spray
session - with the pin block removed)</FONT>. For some time we have =
chosen not
to apply a black slip coating on the bridge cap. I believe a black =
coating can
result in an overheated and damaged bridge cap under stage lighting.
Furthermore, as Dale mentioned, a clear coat allows the beauty of the =
quarter
cut bridge cap to show through.</DIV>
<DIV> </DIV>
<DIV><FONT face=Arial =
size=2>SNIP</FONT></DIV></BLOCKQUOTE></BODY></HTML>