Digital BW, The Print

----- Original Message -----
From: "jhanson_mad" <jimhanson@...>
To: <DigitalBlackandWhiteThePrint@yahoogroups.com>
Sent: Saturday, September 21, 2002 1:15 PM
Subject: Re: [Digital BW] Coating prints with Epoxy?


> Guys,
>
> Our local Woodcraft sells a product called Mirror Coat made by System
> 3 Resins.  One of its stated uses is for bar and table tops.  Don't
> think the epoxy will yellow, but may be concerned with a print
> reacting and changing.  I have not used this product.
> Jim Hanson

A lot of the polymeres have problems with yellowing. For many polymeres it
was even difficult to get them transparent without a tint in the first
place. Often you will see that they are a bit grey. Instead of getting all
of the colour out they added some colorant to get the neutral tint.
Acryl has the best optical properties. The disadvantage is that it can get
brittle if applied in thicker layers.
PVA has nice optical properties but isn't water resistant. Polyurethane
initially was very yellow, can't comment what has been done to get it so
clear and I have no knowledge whether it will show yellowing when it gets
older. It is a very tough resin otherwise. Epoxy isn't known for its optical
specs. As with any material the thinner the layer the better the
transparency, but why start with a material that isn't that good in thicker
layers.

Ernst