i was friendly for a while with a photographer who regularly printed portraits on canvas with liquid light.
he painted the canvas with urethane and then with liquid light ..
the problem with urethane is it yellows ( they used to suggest subbing glass and plexi with urethane. )
without urethane, you will probably have to do a few coats of liquid light, so it really soaks in. you might also experiment
coating it with gelatin as a sub layer if the emulsion frills and lifts from the canvas, but i imagine, like heavy paper
if you put a few coats of the emulsion on, you won't have trouble ...
as for emulsion peels and canvasing ..
there is a company here in ri that i work with pretty often and they do emulsion transfers.
they suggest a small print at first, to test the paper, and then they do as ozjohn described, they peel the emulsion layer free from the paper
they then dry mount it onto canvas and put a uv protective laminate ( from what i remember ) on it and wrap it or stretch it.
they used to have one on their wall as a show piece they did 10-20 years ago .. no fading, no problems, it looked like it was done yesterday.
i have had a few things i wanted to have peeled and wrapped, but i haven't had the time or money to follow through ...
maybe with my latest series ..