Digital BW, The Print

> I have used Krylon Workable Fixativ and Krylon UV Resistant Clear. I
suspect
> that any of the fixatives designed for pastels might do.

So, does anyone know what all these various sprays and coatings
that are proposed here will do to print longevity ?  Obviously
they provide protection to the paper and inks themselves, but
what about the longevity of the spray coating itself ?  Seems
like yellowing and possible cracking could be a serious issue
and reduce the effective life-time of the print well below what
good pigment inks on an acid-free paper would otherwise allow.

I realize that increasing longevity is probably not the main
reason people apply coatings - rather it's to increase DMax,
in the case of Hydrocote PUR on matte papers, or to reduce
bronzing, in the case of the Kamar and Lyson products on RC
papers.  But is it worth it, if longevity suffers ?

Just a thought, John