I'm having issues. I've tried numerous times and I can't get my fine lines to burn clearly on the screen. I have a ryonet exposure unit, using dual core diazo emulsion, and burning for 5 minutes. What's the problem? I've tried burning it longer, it does not work, i've tried burning it shorter, it does not work. I even wash it down with a pressure washer and light scrubbing and it still does not work . What's happening? What am I doing wrong? Please help.