Epoxy on soundboards

[Farrell]

The epoxy doesn't necessarily completely fill every single void in the wood
to some depth (pretty darn shallow anyway). And the epoxy will have some
moisture in it. Heck, even a piece of granite with no cracks in it has
moisture in it. And moisture passes through solid epoxy. In boat building,
epoxy coating wood is generally considered a good moisture barrier. But it
is simply better than paint or polyester at slowing down the rate of
moisture (water) passing through it into the wood. Water still passes
through an epoxy coating.

Terry Farrell

----- Original Message ----- 
From: "Dean May" <deanmay@pianorebuilders.com>
To: "Pianotech" <pianotech@ptg.org>
Sent: Wednesday, October 20, 2004 2:28 PM
Subject: RE: Epoxy on soundboards


> >Just because epoxy is "water proof" does not mean that it is "vapor
proof".
> >You may be able to raise the partial pressure, or slow transfer of water
> >vapor, but eliminating it by coating wood is probably a futile endeavor.
>
> But it's not a coating, it is a soaking, an infusion. If the surface wood
> cells down to some depth are filled with epoxy, where will the water vapor
> go? What structure in the wood will absorb it? Only the very inner cells
> that the epoxy didn't fill will be able to absorb the water vapor if it
> makes it that far.
>
> Dean
> Dean May             cell 812.239.3359
> PianoRebuilders.com   812.235.5272
> Terre Haute IN  47802
>
> -----Original Message-----
> From: pianotech-bounces@ptg.org [mailto:pianotech-bounces@ptg.org]On
Behalf
> Of Don
> Sent: Wednesday, October 20, 2004 11:28 AM
> To: Pianotech
> Subject: RE: Epoxy on soundboards
>
> Hi Dean,
>
> Just because epoxy is "water proof" does not mean that it is "vapor
proof".
> You may be able to raise the partial pressure, or slow transfer of water
> vapor, but eliminating it by coating wood is probably a futile endeavor.
>
> I suspect that the "better tuning stability" may be simply an almost total
> lack of crown.
>
> At 09:30 AM 20/10/2004 -0500, you wrote:
> >The theory is the epoxy penetrates the wood and fills the cells. The wood
> >cells act as a matrix for the epoxy, this is what Del spoke of in the
> >articles. And it does make some sense. So it is not a thin layer of epoxy
> >riding on top of the wood that is providing the stiffness and strength,
but
> >the whole matrix of the wood cells reinforced and filled by the epoxy.
> >
> >I am planning on trying this out soon and my intent is to epoxy both
sides
> >of the board.
> >
> >I would think that the cells penetrated by the epoxy would be resistant
to
> >any subsequent moisture effects.
> >
> >Dean
>
> Regards,
> Don Rose, B.Mus., A.M.U.S., A.MUS., R.P.T.
> Non calor sed umor est qui nobis incommodat
>
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>
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