Just switched to a new emulsion (Ulano Proclaim) and i've noticed that when i coat my screens the emulsion is thicker in the middle area of the screen. This means the exposure time is longer for stuff in the centre and i'm worried it's going to cause issues with the consistency of my line widths. I figured it's something to do with the tension of the mesh. It's looser in the middle so more emulsion gets in... but i'm pretty sure I didn't have this issue with my previous emulsion. This new stuff seems a bit thicker/gummier... would it help to thin it out? Any advice would be great.
Yep, sounds like the mesh tension is slack(er) in the area with a thicker coat. could just be this emulsion is more sensitive to pressure as it's a different material altogether. I would not thin it out, that would be bad. I'd buy new screens or re-tension as slack screens are going to be a pain to print with anyway.
Or, try coating a few one more time with more pressure on your coats and see if that helps.