Before I got in to business making enlargements etc., someone gave me a roll of 42" paper. My darkroom was 48 x 72. I could turn my enlarger head horizontal and enlarge on to a wall outside the door. I made 30 x 40 prints and developed them by sticking the print to a wet tile wall above the bath tub. I developed, stopped, and fixed prints with sponges and washed the prints in the bath tub. Really easy and no real cost.
So you literally just stuck the print to the wall without any kind of fasteners, just moisture?