However, that itself can be caused by various conditions. Emulsion being too thick. Emulsion not being dry all the way through, something that happens easier when the emulsion is too thick. A weak UV light source, which again is more of a problem if the emulsion is too thick.
a) old/defective emulsion.
b) humid environment.
Personally, I prefer my screens a bit slimy on the squeegee side because they are easier to wash.
Then I dry them and post-expose to fully cure.
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