Compression Question

[Delwin D Fandrich]

----- Original Message ----- 
[link redacted at request of site owner - Jul 25, 2015]
To: "Pianotech" <pianotech@ptg.org>
Sent: August 30, 2003 7:31 AM
Subject: Re: Compression Question


> Delwin D Fandrich wrote:
> >
> > According to the comparison trials we conducted at Baldwin, about three
or
> > four sprayed coats. With the exception of epoxy--a lot of epoxy--all
> > conventional finishes responded about the same as a vapor barrier.
> >
> > Del
>
>
> According to my comparisons in the shop four coats of sprayed lacquer
> doesn't even come close to the film thickness of one coat of varnish. I
> am looking for 4 to 5 mills on each side of the board to achieve a
> reasonable vapor barrier. Four coats of brushed varnish or four coats of
> sprayed catalyzed varnish gets me there. I have used lacquer in the past
> but could only achieve about 1 mill in a reasonable amount of time. I
> estimate it would take about 20 or more coats of spray lacquer to get
> enough finish on the board. Of course I don't have the sophisticated
> equipment nor the developed technique of the fine craftsmen at Baldwin.
>
> John Hartman RPT


I wasn't referring to film thickness. I was referring to the effectiveness
of various materials as vapor barriers. Each panel was coated with the same
number of coats of finish and tested for rate of shrinkage and expansion.

Del