Digital BW, The Print

I did two experimental prints on artist's linen coated with a single 
application of Liquitex Acrylic Gesso (for paintings I usually use 3 
coats) -one color and one black and white.

The inititial results are encouraging wrt to color accuracy, 
speading, density, etc, using the same settings I use for Epson 
Archival/Enhanced Matte.  If anything the B+W print looked better 
than the paper one for neutrality and metamerism, probably because 
the linen imparts a warmish tone to it which is not totally obsucred 
by the single coat of gesso, and that swamps the subtle color shifts 
that show up readily on the Epson paper.

Still, I don't know how archival this is or whether I'm damaging my 
print head doing this!   More to the point, while I appreciate the 
suggestions people have made about coating products, I still haven't 
heard anything about the physical and chemical properties of the inks 
and papers/coatings and how they interact.  I'm surprised about this 
considering it IS the medium we've chosen to work in!    Is there any 
forum where people are knowledgable about and discuss stuff like that?