Epoxy on soundboards

[Don]

Hi Tom,

I'm glad to hear that. Have you done "before" and "after" testing with
readings taken in more than one place in the scale of the piano?

So we come back the basic question--what *does* cause a piano to be stable
or unstable? 

At 12:43 PM 20/10/2004 -0700, you wrote:
>    Don,
> 
> My limited experience so far is that tuning stability after a soundboard
>is epoxied is better than before, crown or no crown. I suspect that it has
>more to do with rigidity of the top surface of the board than moisture
>content control.
> 
> Tom Cole
> 
> Don wrote:
>    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 
>mailto:pianotuna@accesscomm.ca		http://us.geocities.com/drpt1948/  3004
>Grant Rd. REGINA, SK S4S 5G7 306-352-3620 or 1-888-29t-uner
>_______________________________________________ pianotech list info:
>https://www.moypiano.com/resources/#archives      
>   

Regards,
Don Rose, B.Mus., A.M.U.S., A.MUS., R.P.T.
Non calor sed umor est qui nobis incommodat

mailto:pianotuna@accesscomm.ca		http://us.geocities.com/drpt1948/

3004 Grant Rd.
REGINA, SK
S4S 5G7
306-352-3620 or 1-888-29t-uner