water based finishing

[gutlo]

It might have to do with "uv filtering".  Some waterbased coatings filter
out ultra violet light protecting the substrate from color alteration, some
don't.  It's possible to add chemicals that sacrifice themselves to uv for a
number of years.

WB urethanes usually don't filter uv, whereas acrylics usually do.

Arthur Grudko
StarHawk Labs
----- Original Message -----
From: <bases-loaded@juno.com>
To: <pianotech@ptg.org>
Sent: Monday, June 10, 2002 7:10 AM
Subject: Re: water based finishing


>
> On Mon, 10 Jun 2002 06:33:32 -0400 "Farrell" <mfarrel2@tampabay.rr.com>
> writes:
> > I don't think the characteristics of any finish alone will cause
> > properly prepared wood to rot. Please correct me if I am wrong.
> >
> > Terry Farrell
> >
>
> Hi Terry -
>
> That is precisely my thoughts.  If that were so, surely all the pianos we
> see these days with thick polyester coatings would be exhibiting severe
> problems.  'Please correct me if I am wrong', also, but I suspect other
> reasons at play here.  I have seen mahogany that was bleached to death
> show grey streaks even after dyeing and/or staining, and perhaps thee are
> other possible explanations for this to occur, but I can't imagine the
> poly at fault.
>
> Mark Potter
> bases-loaded@juno.com