Digital BW, The Print

At 08:36 AM 1/18/2003 +0000, DigitalBlackandWhiteThePrint@yahoogroups.com wrote
 >You also do not always have to prep the surface. I do
 > some printing with an Encad Croma 24 using Ilford
 >archival dye inks straight onto Arches watercolour paper.

For paper I agree.  I've printed on Canson 140# cold
press watercolor paper, brown paper bags, etc, with
interesting results.    But the materials I have in mind are
artist's linen, artist's canvas, sheet metal, and plastic.
All of those things require priming or gesso for painting.

Does anyone know the answers to my questions about
surface preparation for inkjet printing?   If this isn't
the right forum for a question like this could someone
suggest one?  Thanks in advance.