Terry, I've been using the white glue and CA method for field repairs of ivory keytops since I read Susan's description here on pianotech. My "white glue" of choice for this repair is PVCE. Can't speak to the absolute strength of the bond compared to CA alone, but I like to think that the flexibility of the PVCE layer will keep the joint intact in spite of the differential expansion / contraction of wood and ivory. Just like installing plastic tops with PVCE, except you've got a layer of CA to keep the water in the glue from curling the ivory. Bonding, while not "instant", has been fast enough, meaning that after 10 seconds or so I can let go of it and the top neither falls off nor curls. Just my take. Mike On 9/9/2010 7:41 AM, Terry Farrell wrote: > I've tried the white glue/super glue thing and it never seemed to set > up. It's definitely NOT instant. Maybe I just didn't want to wait long > enough - but then, that is one of the major advantages of super glue - > bonds can be within seconds - and is often one of the criteria I use > in selecting CA for a particular application. > > What is the basis for your claim that the CA/water-based glue joint is > much stronger than CA alone? With "CA alone you can truly glue > yourself to yourself in a way which requires acetone and a lot of > patience and determination to reverse. Don't ask me how I know...." > > I hope I don't sound too much like I am berating your Susan! I don't > mean to do that at all. My interest is that I don't want to be missing > out on any great little tech tip like this seems to be....... but I > just haven't been able to figure out what is the advantage of this > over CA with accelerator. > > Do you have a reference for your Journal article? I do remember > reading it, but it's been a while. > > Thanks!!! :-) > > Terry Farrell > > On Sep 8, 2010, at 10:51 PM, allan at sutton.net > <mailto:allan at sutton.net> wrote: > >> That IS a great tip I had been glad to learn! >> >> One piece spread with white glue, the other piece spread with CA >> glue, instant bond, very strong hold. >> >> I am thankfull. >> >> Allan Sutton, m.mus. RPT >> www.pianotechniquemontreal.com <http://www.pianotechniquemontreal.com> >> >> >> 2010/9/8 Susan Kline <skline at peak.org <mailto:skline at peak.org>> >> >> On 9/7/2010 8:29 PM, Bill Fritz wrote: >>> The inventor of cyanoacrylates, Harry Coover >>> <http://wiki/Harry_Coover>, said in 1966 that a superglue spray >>> was used in the Vietnam War <http://wiki/Vietnam_war> to retard >>> bleeding in wounded soldiers until they could be brought to a >>> hospital. >> It's very useful. I've heard that dentists use it for small cuts >> because bandaids worry their patients. >> >> As for the sterility problem, using it for a deep cut, that's why >> we have immune systems. Regular stitches also pose an infection >> risk, even using sterile sutures. >> >> By the way, in case people forgot what I wrote in the Journal >> about it, if you mix CA glue with a water-based glue, the >> resulting bond is so much stronger than CA alone that you can >> truly glue yourself to yourself in a way which requires acetone >> and a lot of patience and determination to reverse. Don't ask me >> how I know ... >> >> Susan Kline >> >> >
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