I would try it without the priming. I've done cyanotype on cotton
T-shirts with little problems. The exposure time was twice what I
ususally use for my favorite paper.
I also think that the cyanotype is unable to bind to the primer.
Cyanotypes also won't work if the media is alkali
Gord
On Tu
The primed canvas is most likely the problem. I would buy raw canvas if you can.
Canvas is such a blanket term, but generally, the tighter the weave the better.
This will help absorb the sizing solution well, not to mention holding
detail
A gelatin sizing, gum arabic, starch sizing, or arrowro
