CA glue

[David Love]

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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.  
David Love
davidlovepianos@comcast.net 
-----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
 
 
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.  
 
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 ----- 
From: David <mailto:davidlovepianos@comcast.net>  Love 
To: 'Pianotech' <mailto:pianotech@ptg.org>  
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.  
David Love
davidlovepianos@comcast.net 
 
-----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
 
These questions should make for some interesting discussion:
 
1) who likes to use CA glue instead of Epoxy for cracked bridges, and
why?
 
2) How long is a cracked bridge repair using CA glue expected to last?
 
3) How long is a loose tuning pin repair using CA glue expected to last?
 
Thanks, Chris Henke
Portland, Oregon

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