I add a drop of 5% Tween-20 to 10 ml of sensitizer to improve the spreading properties. As I recall, I'm using about 1.5 ml to coat an 8x10 sheet of paper using a rod. I use a hake brush for 11x14--wet it with some distilled water first and shake it out. The Tween-20 will prevent the sensitizer from beading up.