Panel drying and finishing

[David Love]

Presumably, then, if it did warp and you just left it in the hotbox longer
it should straighten out once the moisture transfer had equalized through
the panel?

David Love
davidlovepianos at comcast.net 
www.davidlovepianos.com

-----Original Message-----
From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf
Of Ron Nossaman
Sent: Friday, October 24, 2008 2:41 PM
To: Pianotech List
Subject: Re: Panel drying and finishing



> I have heard of some individuals who prefinish the side of the panel to be
> ribbed first masking off the area that will be in contact with the inner
rim
> as well as the ribs.  I have not done this yet the idea of slightly easier
> cleanup of glue without it soaking into the wood near the ribs is
tempting.
> However, I have found that when a piece of wood only has a finish on one
> side and you change the EMC, it tends to warp.  First, why is that and
does
> that tendency suggest that the one side finishing process prior to ribbing
> is a bad idea?
> 
> David Love

It does that because you've slowed the moisture transfer rate, 
thus the dimensional change rate, on the finished side. Is it 
a bad idea? I don't see why except for wasting more time and 
masking tape than if you just trimmed the squeeze out from the 
bare panel after it set up a bit. Different strokes.
Ron N