[pianotech] West System Epoxy as filler/wood rebuilder

William Monroe bill at a440piano.net
Wed Apr 29 16:58:47 PDT 2009


Hi John,

Yep, done it may times - just did it today.  After resurfacing and notching
the bridge, I use the same size pins and I don't redrill.  If the holes are
grossly enlarged, recap.  Mix West System without fillers, and transfer to a
large hypo-oiler.  I then use a strong squeeze clamp to encourage the epoxy
to leave the oiler faster than you can squeeze it (it's pretty viscous).

I insert the oiler to the bottom of the hole, and fill the holes.  Sometimes
going back over them as the epoxy finds all the cracks and seeps into the
entire bridge.  I drive the pins in to the desired depth, and use old panty
hose (knee-high's work nice) to shoe shine the top of the bridge and get the
epoxy to coat the bridge top and notches evenly.  I'll also use a nice,
square-edge piece of hammer felt to swab/swipe the notches and spread the
epoxy evenly there.

If I'm doing it by myself, I'd do it in three passes - each half of the long
bridge and then the bass bridge.  That should give you enough time to get
things wrapped up before the epoxy thickens too much.  If in doubt, do four
batches.  When all's dry shoot it with a coat of lacquer.

William R. Monroe



On Wed, Apr 29, 2009 at 9:11 AM, John Dorr <a440 at bresnan.net> wrote:

> Hi,
>
> I've got a bridge I'm working on with enlarged, though not really cracked,
> holes.  Rather than put in ever-larger pins, I thought I might try the West
> System Epoxy to fill the holes and then re-drill them.  Has anybody tried
> this?  Have recommendations for/against?  And if for, what filler would you
> prefer to use?
>
> Thanks in advance,
>
> John Dorr,
> Helena, MT
>
>
>
>
>


-- 
William R. Monroe, RPT
A440-William R. Monroe Piano Services, Inc.
314 E. Church St.
Belleville, WI 53508
608-215-3250
www.a440piano.net
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