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
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