[pianotech] plate finish

[Mark Potter]

Ron - No personal experience with the crinkled brown finish, or with polyester primer, but....

If the finish is intact, and the solvent used for the polyester (what is it?) isn't agressive to the point it can "lift" the previous finish, it is extremely doubtful you will encounter problems.  A safeguard, if in doubt, would be to apply a 2lb cut of dewaxed shellac to the levelled finish before applying the polyester.  I have never had a compatibility issue when using this "barrier coat" procedure, no matter what the finishes were, and have never witnessed any problems down the road.

Mark Potter

--- On Fri, 9/18/09, Ron Nossaman <rnossaman at cox.net> wrote:

From: Ron Nossaman <rnossaman at cox.net>
Subject: [pianotech] plate finish
To: pianotech at ptg.org
Cc: "caut at ptg.org" <caut at ptg.org>
Date: Friday, September 18, 2009, 7:38 PM


I have a rebuild estimate out on a S&S B with the brown (or whatever it is) crinkled plate finish. I haven't yet had the - uh - experience of finishing one of these, so I shot in the dark on that part of the estimate. Should the sky open up and this actually comes through, am I going to have to take this down to bare iron to refinish it after modifications, or will leveling it some and loading on the polyester primer do it? How tough is the stuff? If this process is going to be ugly, I don't want to be unduly surprised. Despair and resignation going in, I can do. Not that it'll happen, but...

Ron N
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