Digital BW, The Print

As most of you know, inkjet inks, especially the pigmented,
archival ones, need a porous surface to dry.   If you print
on a nonporous surface they will stay wet for a long time,
and the rollers on the printer will track ink across everything.

As an experiment I tried printing on an acrylic sealed 
canvas this morning and the ink is STILL tacky, 9 hours
later!

Recently when surfing the web I came across a couple of 
places selling bottles of stuff you could coat paper, cloth, 
etc with so you could inkjet print on it.   But I can't
remember where I saw these.  Does anyone know who sells 
this stuff?   Thanks in advance!