[pianotech] Soundboard Lacquer Finish

William Monroe bill at a440piano.net
Thu Mar 19 20:37:51 PDT 2009


Nope, no paste polish to recommend.  I don't use that approach.  If I did,
I'd probably use something like the swirl mark remover I use for poly, or
meguiar's or some such.  But, my approach is more like PRJ's.  Sanding
sealer first, brushed on, sanded to 220, followed by 2 coats (usually) of
lacquer or poly, again brushed on.  After that, it just depends upon the
weather what I do next.  Sometimes rub out, sometimes nothing.  I've had
boards come out so nice and clean and smooth, that I've found no reason to
expend needless energy.

I've used both semi-gloss and hi-gloss poly and like them both fine.  Just
depends upon what I'm after.  After an exchange with PRJ a while back, I
think I'm going to try the spray shellac/spray lacquer next.

Paul, I'm not sure I follow your routine:

Is it medium shellac, heavy shellac, lacquer?

William R. Monroe
www.a440piano.net

On Thu, Mar 19, 2009 at 9:42 PM, Nick Gravagne <gravagnegang at att.net> wrote:

>  William,
>
>
>
> Do you have a paste polish to recommend? I appreciate the tip RE electric
> polishers. Sanding to higher grits, followed by a polish sounds like the
> plan for now.
>
>
>
> I have heard some talk RE polyurethane, but for some reason I can’t seem to
> get with it; probably too much experience with lacquer, and the boards sound
> good, not weighed down. But I am willing to be convinced otherwise. Are
> there advantages to poly over lacquer?
>
>
>
> I am spraying on the lacquer, but brushing on the shellac. I use a Mohawk
> reducer (thanks to M. Spreeman) in the lacquer along with the lacquer
> thinner and the flow out seems pretty nice; no sandy or matted looking
> sections.
>
>
>
> Thanks William.
>
>
>
> *Nick Gravagne, RPT*
>
> *Piano Technicians Guild*
>
> *Member Society Manufacturing Engineers*
>
> *Voice Mail 928-476-4143*
>
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