(Quoted from International Coatings' Keith Stevens. Full article here.)
“I’ve been having issues with the image washing out of my screen after exposure. What is causing this, and are there ways I can avoid this?”
This was a question posed by a Printwear reader, and here is Kieth Stevens’ response:
Underexposing the emulsion is the most likely culprit in why it is washing out. Check to see if the emulsion on the squeegee side gets sticky or slimy as you are rinsing out the screen.

Click here to read the full article