[pianotech] Second dose of CA?

[Susan Kline]

Yes a second application will work better than just one, and I'm
of the minimal amount school. For one thing, the fumes are toxic.
And if the pins are loose and water-thin CA follows the tiniest cracks with
ENTHUSIASM, how could you fail to get the CA where it needs to be,
and without tilting?

I feel repeated applications, used only on the pins which are not holding,
is the way to go, and I have a theory as to why.

CA loves tight cracks. It goes along them fast as anything. So,
picture the first application to a separated and cracked pinblock.
The CA rushes into the cracks, and most of it leaves the area
immediately surrounding the pin. It's following all those separations
and cracks. But then, you do the second application. The places
it went the first time are now sealed. The second application sticks
around in the local area much better, because it can't follow all
those cracks anymore. And on a really bad piano in a difficult climate,
a third application might work better yet. Eventually, you should get
to a point where the CA is actually lining the tuning pin hole,
like cartilage lines a knee joint.

So, I'd advise using it on any pins now loose, and later using it
again on any which didn't respond, possibly twice. And not using it
on any pins which have sufficient torque. You don't want to splash
around ounces of the toxic stuff, and you don't want to soak the tuning
pin coils, which can seize.

Susan Kline

Dean May wrote:
> Yes, you can often get very good results with a second application. Years
> ago when CA was starting to be used on pins there were two extremes of
> application: one used 4 to 8 oz of glue, so much that glue ran everywhere.
> The other put barely any glue on at all. I find 1 to 2 oz is plenty for most
> pianos. Do a good soaking on the bushings as I believe that is where most of
> the holding power comes from. 
>
> You likely have a piano that had barely any CA put on it, so a second
> application may be just the ticket. It is cheap and easy to try, so why not?
> You certainly won't make anything worse. 
>
> If, after treating a few pins, it doesn't look like the CA is penetrating
> much, you might try drilling a tiny hole at the 6 o'clock position of the
> pin. Someone posted a protocol on this a few months ago for a second
> application scenario and said it worked well. You might check the archives,
> but as I recall you angle the drill so that it penetrates to the pinblock as
> it comes up to the pin. You are just creating another channel for the CA to
> travel further into the hole. Sounds like it should work great. 
>
> The flipping the piano upside down and applying from the bottom will also
> work. Be sure to remove lid and hinges from rim before rolling it over. 
>
> If it is only a few pins giving you grief, then remove the pin, squirt 6-8
> drops of CA around the hole, re-insert pin. I have never had that not work.
>
> Dean
> Dean W May                (812) 235-5272 voice and text 
> PianoRebuilders.com    (888) DEAN-MAY        
> Terre Haute IN 47802
>
> -----Original Message-----
> From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf
> Of Paul Mulik
> Sent: Friday, August 24, 2012 8:34 AM
> To: pianotech at ptg.org
> Subject: [pianotech] Second dose of CA?
>
> A school that I tune for has a mid-1970s Kawai grand that's on its last
> legs. The tuning pins are too loose to hold a tuning, but somebody at some
> point in the past has already used CA glue on them. Is there any point in
> another CA application, or is it a hopeless case at this point?  I've
> already told them there's not a lot I can do for it at this point, but like
> schools everywhere there's not enough money to spend on extensive repairs or
> a new piano. 
>
> Paul Mulik
> Joplin, MO
> Sent from my U.S. Cellular BlackBerryR smartphone
>
> -----
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