Polyurethane Finishes on pianos

[Isaac OLEG SIMANOT]

Hello,
As I understand what you said here it is an oil based varnish that you buff
before applying a new coat of finishing (may be black French polishes on
this ?)

Am I correct, and if so, why do you use 'rubber' ? I thought it was with
foams or cotton that we can buff this kind of finish.
Or does rubber mean something else ?

I had sometime good results on a refinishing with a cellulosic French polish
that could be use on an existent finish (oil based) assuming the precedent
was decontaminated, buffed and clean.

But I don't know how to have black French polishing. What kind of tint do
you use ?

Thanks.

And an Happy good year to all.

Isaac OLEG

> I'm at present working on a
102 year-old 6'7" black grand.  At least
> 70% of my labour was done 103 years ago in Germany.  All I have to do
> is thoroughly clean and ease down the existing finish and commence
> the polishing work with the final body and finishing rubbers.  A job
> that might have taken 130 hours if I'd needed to strip, will probably
> take less than 40 hours in total.  Sadly this is possible only with a
> black piano.
>
> Bonne année!
>
> JD
>