Fw: Fw: Plate Finish, Shellac as sealer caution

[Erwinpiano]

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  Roger thanks

   One thing that is important when applying other  products with =
dissimilar solvent bases over shellac is that since there is no similar =
solvent to bite and bond to the shellac it must be sanded so that there =
is a tooth for a good mechanical bond.  When I used to put varnish over =
my shellac base on my boards I would allow to dry thoroughly(24 hrs.) =
then sand lightly.

     Another great feature of shellac is that it seems as though it case =
hardens the surface of wood.  This would have obvious tonal benefits as =
well as strength.
  I always coat my bridge notches with it before the lacquer.  That's =
one place I don't sand but have not had a failure Hmmmm.

      Good Day

   Dale Erwin


----- Original Message -----=20
From: jolly roger=20
To: pianotech@ptg.org=20
Sent: Sunday, July 01, 2001 10:07 PM
Subject: Re: Fw: Plate Finish, was Varsol


At 08:32 PM 7/1/01 -0700, you wrote:=20

  Hi Mark

  I'm aware of the many amazing properties of shellac but it just never =
occurred to me to try it in this application until you guys tweaked my =
duh! barrier.  This might be my answer.I'm in the middle of a plate job =
that is a very long and arduous story.
      Thanks

    Dale Erwin
  Hi Dale,
                   The only other time I used it as a sealer.  A =
customer had stripped a cabinet themselves and oiled the case, then =
decided to have the piano rebuilt and refinished.  No matter what we =
washed the stripped case with, stripper, lacquer thinner, alcohol.  The =
oil would do it's nasty work on the finish, from below. A few coats of =
shellac to seal the grain.   It worked like a charm.   That's what =
twigged me to use it on the plate.=20
  My re finisher mentioned that he now uses it as a sealer on Oak dining =
room table tops, for a full grain finish, and reckons he has less =
problems with shrinkage.
  Roger


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