15. Now I apply the sizing to the corner. Again to make for a nice clean cut later. To help hold the canvas in place in the corners I applied push pins to the extra canvas on the opposite walls. The secret here is to allow a bit of extra canvas to lift up between the corner and the push pin. That way it will apply positive pressure to the corner to keep it from lifting up before drying. It will also keep the canvas from being glued to the opposite wall if any glue got on there.
16. One more pass with the putty knife.