Question about rubbing a satin finish

[Isaac OLEG]

Hi Paul,

Thanks for your ideas, I was persuaded that the matt or semi matt
(satin) finishes where the result of direct spraying of polyester.

The lacquer people I talked with explained me that, while telling me
that they are reluctant to refinish pianos in these matt or satin
finish because they need then a special room much cleaner than they
usual spraying room (and these guys make all Steinway finishes here,
with new brass logos, , really looking like new).

My instrument is actually in semi matt finish, but if I try to polish
it, the surface is not clean (kind of orange skin surface, and uneven
reflects).
So I was ready to fine sand it (with water) , and try to polish again.
My inquiry is mostly about a good method (pumice, fine abrasive foams,
whatever) , to obtain a matt look or semi matt, after the polishing.

I did not thought of the possibility to spray a coat of lacquer, but
why not ? What kind of lacquer could I use on a polyester ? As I have
to install a new logo I will need to use some lacquer anyway.


Thanks again, and Best regards.

Isaac OLEG

Isaac OLEG

Entretien et réparation de pianos.

PianoTech
17 rue de Choisy
94400 VITRY sur SEINE
FRANCE
tel : 033 01 47 18 06 98
fax : 033 01 47 18 06 90
cell: 06 60 42 58 77

> -----Message d'origine-----
> De : Paul McCloud [mailto:pmc333@earthlink.net]
> Envoyé : vendredi 14 mars 2003 06:58
> À : oleg-i@wanadoo.fr; 'Pianotech'
> Objet : RE: Question about rubbing a satin finish
>
>
> Isaac;
> 	I have done a lot of work with polyester finishes, short of
> complete refinishing.  If you have some scratches, they can
> be sanded
> out and repolished.  If you have a polishing machine, it is so much
> easier too.  I've used the liquid polishes with the
> bonnets, and also
> the rouge sticks on a buffer (used on the edge of the
> buffing wheel).
> If you use the proper sanding techniques (see the last
> couple of Journal
> articles by Ruth Phillips), you will have an invisible repair.
> 	If you want to turn the piano into a satin finish, it will be
> much more work.  The factories usually apply the polyester,
> rub it satin
> with (I don't know what, pumice, steel wool, sandpaper?)
> and spray with
> lacquer.  If you try to make the raw polyester with a satin
> finish, it
> doesn't look so good, so the lacquer sprayed on looks better.
> 	Don't worry about the gloss finish not looking good.
> You can do
> it.  Just remember not to sand with your thumb or finger-
> use a flat,
> hard sanding block.  Especially with grits like 400 or 600
> paper, you'll
> make a dip that you can see after it's all buffed up glossy.
> 	If you need more info, you can write me.
> 	Good luck,
> 	Paul McCloud
> 	San Diego
>
>
> -----Original Message-----
> From: pianotech-bounces@ptg.org
> [mailto:pianotech-bounces@ptg.org] On
> Behalf Of Isaac OLEG
> Sent: Thursday, March 13, 2003 10:23 AM
> To: Caut; Pianotech Mailing list
> Subject: Question about rubbing a satin finish
>
> Dear colleagues,
>
> I try to make my mind on the possibilities to rub (machine
> polish) an
> original polyester satin finish, that was not intended to be treated
> as that for what I understand (direct final surface from spraying).
>
> This particular instrument have a few scratches I could
> sand and rub,
> but I am afraid that the final product will show rub marks, uneven
> reflects, or the kind of unacceptable defects.
>
> So I wander if some of you know a good technique to obtain an
> acceptable matt or semi gloss finish by abrasion (or may be with the
> help of some finishing product).
>
> I have the tools to fine buff or rub, pastes, liquids, very
> fine foams
> to be used with the polishing machine (abrasive foams 2000 or 3000
> that can be used wet), abrasive powders, cotton wheels, and so on.
>
> Any experience with that kind of finish ?
>
> Thanks in advance
>
>
> Isaac OLEG
>
> Entretien et réparation de pianos.
>
> PianoTech
> 17 rue de Choisy
> 94400 VITRY sur SEINE
> FRANCE
> tel : 033 01 47 18 06 98
> fax : 033 01 47 18 06 90
> cell: 06 60 42 58 77
>
> _______________________________________________
> pianotech list info: https://www.moypiano.com/resources/#archives
>
>
>