Epoxy on soundboards

[Dean May]

>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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