Digital BW, The Print

----- Original Message -----
From: "Robert Morrison" <rmorrison@...>
To: <DigitalBlackandWhiteThePrint@yahoogroups.com>
Sent: Monday, October 14, 2002 9:28 PM
Subject: Re: [Digital BW] Is there a difference? - Coatings


> On 10/14/02 8:26 PM, "Paul Roark" <paul.roark@...> wrote:
>
(snip)
> >
> > Varathane makes several water-based "Diamond Wood Finishes" (blue can at
> > your local hardware) that appear to work very well -- no dilution
needed.
> > The "Outdoor" version has UV inhibitors that could be useful (in fade
> > testing now).  However, I don't like much yellowing, and, like UV
filters,
> > these UV inhibitors are slightly yellow.  The Eclipse, however, is
bright
> > enough and blue enough that with one coat it stays bright and 0.01 units
> > cool.
> >
> > EAM just gets too yellow with the UV inhibitors.  So, to get rid of them
> > with polyurethane, use Varathane "Interior."  This formula was made for
> > maximum clarity.  With EAM the first coat remains almost a matte and the
> > Dmax is only up to 1.72.  However, with a second coat EAM is a nice
luster
> > with up to 2.33 for the Dmax.
>
> Stay clear of polyurethane--they yellow terribly.  Martin's varathane
prints
> turned completely yellow in about 6 months.
>
> The water-based golden products are all 100% acrylic...absolutely no
> polyurethanes.
>
> Robert
>
Paul,

Robert is definitely correct on this. I coated a number of prints with the
Varathane Diamond coating that are now about 16 months old. The Varathane
coated prints are now extremely yellow and the Golden Acrylic coated prints
are unchanged. It is a shame because I found the Varathane the easiest to
work with. Another choice that has held up well with time was a water based
vinyl coating called ClearSheild that is sold by sign making supply
companies for over coating inkjet printed banners for outdoor display.

Martin