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PVC-E use to be my favorite, buts its increasingly hard to get and is temperamental in cold weather, thus you can't even get it in winter. I decided to test 7 different glues from Home Depot. I found 1 that works great, and i found one that is usually highly recommended that doesn't work very well at all. The problem with plastic is that there are many different kinds so testing becomes necessary. This video will save many Techs some research and money.
-chris



"Where TONE is Key, and Mammoths are not extinct."

Youtube https://tinyurl.com/5aw83b73


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The talk these days for keytops seems to be Roo Clear melamine adhesive (or Titebond Melamine adhesive...)

There is also the suggestion of Evacon-R.

I guess absolute strength is not necessarily the top priority - how much "prising-off" force are piano key coverings subjected to in playing? Other factors may come into play, as long as the key coverings don't actually fall off; curing time, ease of cleaning any surplus, not drifting while curing etc.......

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Do we really want a totally permanent fix? I've cursed some factories in the past when their keytops have to be chisled off a mm at a time.


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The real issue with keytops AFAIK is the fact that the wood of the key is constantly moving underneath as it expands and contracts with ambient humidity changes, whereas the keytop material does not (virtually speaking). It is this phenomenon that gradually degrades the adhesive interface. So one wants an adhesive that can effectively deal with this and remain ADHESIVE for a good many years.

Thx Chris for this demonstration.

Peter Grey Piano Doctor


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Very good points Peter. I also wanted to try Roo Glue and Titebond Melamine glue, but the Home Depot here doesn't carry them. My thesis was to find easy to get glue that work. To get the glues above would require high shipping costs as well.


"Where TONE is Key, and Mammoths are not extinct."

Youtube https://tinyurl.com/5aw83b73


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Local acquisition convenience is definitely a plus. I never even heard of those two glues. All the others I am familiar with. Surprised about the 6000 though. Would certainly work in a pinch I think though.

Peter Grey Piano Doctor


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Thanks for this Chris.

I have used Titebond PL for plastic sharps and it works very well. The drawback I would have with either of your top choices is that they are not water based. This makes clean-up a lot harder.

I currently use Roo Glue Clear. It's stronger than PVC-E and thicker so there's less drips. The key top needs to be pressed, but does not need to be clamped. However, some key top fronts need blue tape to hold them in place. I can usually begin to work the keys in about an hour. Additionally, any glue that might get on the surface can be removed with a wet rag.

I get my supply from Amazon.


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I think Roo Glue Cleqar is melamine glue. There is a Titebond equivalent, and no doubt other makes too.

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The squeeze tube was also a plus. My granddaughter did her first keytops and didn't get any glue on the playing surface because of it.
-chris


"Where TONE is Key, and Mammoths are not extinct."

Youtube https://tinyurl.com/5aw83b73


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Iv always used contact cement.


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I see that a lot and contact cement just don't hold up over time.

I can report that the loctite premium is a complete success. Those keytops are not coming off anytime soon. The glue also glues plastic to keyfronts as well.

-chris


"Where TONE is Key, and Mammoths are not extinct."

Youtube https://tinyurl.com/5aw83b73


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Chris,

Is there an "etching" going on there so as to secure the plastic? Can you tell what the solvent is? Or is it in fact a CA formulation?

Peter Grey Piano Doctor

Last edited by P W Grey; 03/02/22 07:59 PM.

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Contact cement lasts a very long time if you use it correctly.
A local that replaces key sets for a living used it.


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Peter, they are not CA Glues, and yes there is a strong bond with the Gorilla Clear and Loctite Premium. I just released a new video in which i test two more glues, Titebond Quick and Thick since i know a lot of people use it. After my test, i don't recommend it as it doesn't bond. I found another glue called Fuse it by Liquid Nails which is now my favorite.
See the video of the tests.
-chris


"Where TONE is Key, and Mammoths are not extinct."

Youtube https://tinyurl.com/5aw83b73


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Cool! Iike it.

Peter Grey Piano Doctor


Peter W. Grey, RPT
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www.seacoastpianodoctor.com
pianodoctor57@gmail.com
https://www.youtube.com/watch?v=PK0T7_I_nV8

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