Digital BW, The Print

So there's no protectorant spray for matte papers that has UV blocking
in it? That seems odd to me. Is there some technical reason why this
is the case?

Scott

Paul Roark wrote:

> Steve,
>
> > Does anyone know the pros and cons of using protectants such as 
> PremierArt
> > Print Shield, Krylon Preserve It!, Clear Shield and other such products?
> >
> > To what extent, if any, do they actually preserve a print?
> > How do they change the appearance?
> > What are you guys and gals using?
> >
>
> My fade tests, consistent with Wilhelm's, show that PremierArt Print 
> Shield
> increases the pigments' resistance to fading. In one of my tests the 
> MIS UT
> pigment's that were sprayed faded about 10% slower, and the UC pigments
> faded about 30% slower (bringing them almost up to the MIS standards).
>
> The coatings without UV blockers in them (like Lascaux) have been, at 
> best,
> neutral in my fade testing. Between the lines, it looks like Wilhelm's
> results may indicate that the coatings add some degree of protection by
> slowing the rate of oxidation. This is what I'd expect in theory, but my
> "initial" (relatively short) fade tests have not found that.
>
> All the coatings I've used increased glossy paper dmax and reduce matte
> paper dmax. Lascaux reduces matte paper dmax the most and is what I use on
> matte papers. Three light coats offer some protection against abrasion 
> with
> no significant appearance alteration.
>
> Many, particularly older coatings yellow with age or otherwise have 
> negative
> results. I, therefore, don't trust coatings unless they have been used for
> years or have been tested by someone I trust. PremierArt Print Shield and
> Lascaux (the well known Rohm & Haas B72 formula) fit into this 
> category and
> are what I use.
>
> The quality of the nozzle is an important factor. Many sprays just do not
> go on evenly.
>
> The water-borne coatings are hard to apply smoothly, tend to get dust in
> them due to slow drying, tend to remain tacky for a very long time, and
> alter the appearance of the print across most of the grayscale ramp. (As
> such, they need their own profiles.) I don't use them.
>
> Hope this helps.
>
> Paul
> www.PaulRoark.com
>
>
>
>
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