CA glue

[Farrell]

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If you go to http://www.westsystem.com and click on "Product =
Information" and then "Typical Physical Properties" you will get a bunch =
of info describing tensile and compressive strengths and hardness of =
West System epoxies. I would imagine CA manufacturers might have similar =
data on their products.

Anyone seeking info on epoxy really should spend some time on the West =
System web site. It is packed with all sorts of info. I find myself =
constantly going back to it to check various details or look for an idea =
when faced with an application dilemma.

Terry Farrell
  ----- Original Message -----=20
  From: David Love=20
  To: 'Pianotech'=20
  Sent: Friday, September 17, 2004 3:41 PM
  Subject: RE: CA glue


  Maybe harder isn't the best way to express it.  Resistance to =
compression is what I'm thinking of.  While in the case of a loose =
bridge pin where the space is very small CA seems to work fine (though I =
think epoxy is better assuming you have a way of delivering it) CA is =
not really designed for "gap filling" in spite of the label on the =
bottle. =20

  David Love
  davidlovepianos@comcast.net=20

  -----Original Message-----
  From: pianotech-bounces@ptg.org [mailto:pianotech-bounces@ptg.org] On =
Behalf Of Carl Meyer
  Sent: Friday, September 17, 2004 10:33 AM
  To: Pianotech
  Subject: Re: CA glue

  =20

  =20

  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.

  =20

  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.

  =20

  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

  =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.

  =20

  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.

  =20

  Carl Meyer Ptg assoc
  Santa Clara, Ca.

  =20

  =20

  =20

    ----- Original Message -----=20

    From: David Love=20

    To: 'Pianotech'=20

    Sent: Thursday, September 16, 2004 7:39 PM

    Subject: RE: CA glue

    =20

    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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