HOT KEYTOPS

Posted by: Pianomansaint

HOT KEYTOPS - 11/08/04 04:37 PM

Has anyone ever used hot hide glue to install keytops? Any pros/cons? And what do you do when you have a set of keys which have a few heads about an 8th of an inch smaller than the others? Should I trim the plastic to fit the wood? or should I laminate the wood?
Posted by: BDB

Re: HOT KEYTOPS - 11/08/04 04:48 PM

I use a glue that works with plastic. It might be possible to do it with hide glue, but I haven't managed to get it to adhere to the plastic well enough. Acetone based glues are awful to work with, but they do the job.

Unless they absolutely won't fit, I use molded one-piece tops and fronts, so they line up properly without a lot of fuss. If they are too wide, I trim them with a strip sander, files, and cabinet scrapers. Sometimes I will build up the side of the key with filler if wear has worn into the side of the key a lot, but I preserve the shape of the key.
Posted by: SamLewisPiano.com

Re: HOT KEYTOPS - 11/08/04 04:54 PM

contact cement. The spray can kind is great if you only do this occasionally. As far as the head problem, sounds like you should order a set of "long" heads, but I'm not really sure what is wrong from your description.
Posted by: Pianomansaint

Re: HOT KEYTOPS - 11/08/04 06:34 PM

My question was has anyone used hide glue? I have used other glues but was wondering if anuone ever used hide glue. And the WIDTH of the head is the issue not the length. I dont know if this was a problem with the piano itself but it is not wear.
Posted by: Larry Buck

Re: HOT KEYTOPS - 11/09/04 05:35 AM

Trim the plastic.

Bill Spurlock in Vacaville CA has published in the PTG journal some great ways of trimming the plastic.

Only add wood to the sides if you feel the key is too narrow to begin with.

Hide glue is very sticky. Mechanical bond only.
Plastic is very smooth and there is not much there for a mechanical bond.

Ivory is usually grooved on the underside to facillitate the mechanical bond. Hide glue with a whitener works great on ivory.

For Plastic I work with and like..
PVC-E glue. Water based and water clean up works great. It cross links and etches to the plastic as it cures and will hold very well.

NO Smell!!!

Available from Schaff Piano Supply.

NOTE....!!! Be sure to clean up any of this glue from the top of the key as it will leave a permanent mark. Usually clean with a wet then dry loth.
Posted by: Pianomansaint

Re: HOT KEYTOPS - 11/09/04 03:03 PM

ok thanks
Posted by: Bill Bremmer RPT

Re: HOT KEYTOPS - 11/09/04 04:39 PM

Victor Benvenuto in Miami always strings 'em cheap.