CA glue

[Carl Meyer]

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David, I'm not sure I agree with you about epoxy being harder than ca. I =
have used both ca and epoxy to fill rather small cracks in soundboards.  =
I don't recall, but I think the ca was the gap filling one.

I would put masking tape on each side of the crack and fill so that the =
filler would be tape thickness higher than the wood.

I would then scrape to level the surface.  It was a pain to scrape the =
ca because it was so hard that it dulled my scraper. =20

That said, I think both ca and epoxy are wonderful products and have =
many uses.  There are also many opportunities to screw up with them.  =
DAMHIK.

It seems that ca and epoxy adhere to each other very well.  I know a =
tech that will seal the top of a crack with a white (tinted) epoxy =
paste, then turn the piano on its back and fill the bottom with ca.  I =
don't know the thickness of the ca he uses.  I think I would prefer a =
thin epoxy on the bottom.

Carl Meyer Ptg assoc
Santa Clara, Ca.



  ----- Original Message -----=20
  From: David Love=20
  To: 'Pianotech'=20
  Sent: Thursday, September 16, 2004 7:39 PM
  Subject: RE: CA glue


  For larger bridge cracks and repairs I prefer epoxy.  It is better at =
gap filling, cures harder and has better adhesion properties.  I prefer =
CA glue for securing loose bridge pins or when the cracks are hairline =
and you need wicking properties.  I wouldn't expect either to fail if =
you didn't use the material beyond what it was designed for.  CA glue on =
loose tuning pins is hard to predict since the pin is being moved =
periodically, however, I have used this repair on several occasions and =
have not had a problem even after several years. =20

  David Love
  davidlovepianos@comcast.net=20

  =20

  -----Original Message-----
  From: pianotech-bounces@ptg.org [mailto:pianotech-bounces@ptg.org] On =
Behalf Of Chris Henke
  Sent: Thursday, September 16, 2004 8:17 AM
  To: Pianotech Listserv
  Subject: CA glue

  =20

  These questions should make for some interesting discussion:

  =20

  1) who likes to use CA glue instead of Epoxy for cracked bridges, and =
why?

  =20

  2) How long is a cracked bridge repair using CA glue expected to last?

  =20

  3) How long is a loose tuning pin repair using CA glue expected to =
last?

  =20

  Thanks, Chris Henke

  Portland, Oregon

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