Tech/maintenance Super glued pads - a cry for help

[Jive Dadson]

Hello, folks. Many of you may know me from that other site.

A while back, I bought a nice, shiny purple logo Yts-32 from a guy in Japan. It arrived unplayable due to leaks. No prob, I think. I'll fix 'er right up. Wrong again.

The pads are glued in with ca glue. Lots of it, filling the cups. It is very hard and thick. I have scraped out a couple of pad cups. It was a long, tedious drudge. Acetone barely softens the surface.

Is there a better way?

 

[Tuppertn]

There is such a thing as CA debonder. I've used it in small amounts when working with model airplanes. It sounds like you'll need quite a bit of it for that job though.

Something like this, maybe?

Superglue Remover

 

[turf3]

There is such a thing as CA debonder. I've used it in small amounts when working with model airplanes. It sounds like you'll need quite a bit of it for that job though.

Something like this, maybe?

Superglue Remover

Probably just acetone.

Did you try heat? Are these nickel plated keys, which you can get pretty hot without discoloration? Is it all of them?

 

[Jive Dadson]

The keys are lacquered. Yts-32, not 23. It is basically a yts-52 for the Japanese market. I wish I knew what kind of lacquer it is.
Heat does nothing to the glue. It is old and very hard.

 

[Tuppertn]

Probably just acetone.

It isn't...or at least not only acetone as it's skin-safe. It's a fairly thick gel with a slimey feel to it. Takes about 15 minutes to work and doesn't evaporate.

Acetone will eventually work. It just takes a while to soak in.

 

[LostCircuits]

Freeze it, super glue pops right up when you get to -15-20 C

If you can find a freeze spray (even a dust-off) you can chill the cup faster than the cold transfers to the glue and the difference in thermal expansion will break most of the adhesion without making a mess, likewise if you have the entire cup frozen and rapidly heat up the metal the glue will fall out.

 

[turf3]

It isn't...or at least not only acetone as it's skin-safe. It's a fairly thick gel with a slimey feel to it. Takes about 15 minutes to work and doesn't evaporate.

Acetone will eventually work. It just takes a while to soak in.

Well, with lacquered keys I'd be concerned about acetone. I suppose Yamaha used some kind of epoxy or urethane clear coat, not nitrocellulose, but still, extended exposure to acetone might be hard on the key finish.

 

[wakyct]

Heat does nothing to the glue. It is old and very hard.

What did you try? I feel like a hot air gun would do the trick.

 

[Jive Dadson]

Freeze it, super glue pops right up when you get to -15-20 C

If you can find a freeze spray (even a dust-off) you can chill the cup faster than the cold transfers to the glue and the difference in thermal expansion will break most of the adhesion without making a mess, likewise if you have the entire cup frozen and rapidly heat up the metal the glue will fall out.

Thank you, thank you, thank you. Freezey spray arrives Monday. Minus 40 degrees.

 

[PigSquealer]

What did you try? I feel like a hot air gun would do the trick.

Nope, that doesn’t work. I’ve tried. A good worthy suggestion though.

 

[PigSquealer]

@Jive Dadson , sorry but I don’t remember you from the other place. Still, I extend a warm welcome to you joining here at the Café. A peaceful place where all try to help each other. No Bots, just real people.
Typically Yamaha finishes are very tough. I don’t know what the purple label era finishes were made from. Honestly I haven’t had one on my bench. I’ve worked on a few YAS21’s, but post purple label. Later years yes. Likely a urethane / epoxy finish that’s tough as nails.
Gurrrrr, The cyanoacrylate group is particularly a sticky (pun intended) pain to remove.
It’s worth reviewing the Wiki history for general knowledge.

Cyanoacrylate - Wikipedia

en.wikipedia.org

It’s my understanding that this product technology was once reviewed for the application of NASA space shuttle program. This to attach the protective tiles. The product has a huge thermal range and bonding capacity.
Oddly there’s hope to chemically remove the material. Good Off. Super Glue Remover - Goof Off
@Dr G our resident material scientist may have other suggestions.

PS. I’m curious on how the cryogenic attempt works out. I don’t see cryogenic cold effecting the finish FWIW.

 

[Dr G]

@Jive Dadson , sorry but I don’t remember you from the other place. Still, I extend a warm welcome to you joining here at the Café. A peaceful place where all try to help each other. No Bots, just real people.
Typically Yamaha finishes are very tough. I don’t know what the purple label era finishes were made from. Honestly I haven’t had one on my bench. I’ve worked on a few YAS21’s, but post purple label. Later years yes. Likely a urethane / epoxy finish that’s tough as nails.
Gurrrrr, The cyanoacrylate group is particularly a sticky (pun intended) pain to remove.
It’s worth reviewing the Wiki history for general knowledge.

Cyanoacrylate - Wikipedia

en.wikipedia.org

It’s my understanding that this product technology was once reviewed for the application of NASA space shuttle program. This to attach the protective tiles. The product has a huge thermal range and bonding capacity.
Oddly there’s hope to chemically remove the material. Good Off. Super Glue Remover - Goof Off
@Dr G our resident material scientist may have other suggestions.

PS. I’m curious on how the cryogenic attempt works out. I don’t see cryogenic cold effecting the finish FWIW.

Thanks, Piggy, but that's outside my scope. Unlike some others, I won't b.s. what I don't know about.

I defer to @turf3. Tag!