Screen Printing magazine ST Media Group Holding Design Detail Underexposing is not the answer Underexposing screens in order to hold more detail does more harm than good.
Underexposed emulsion is weaker and more liable to cause pinholes and breakdown on the press.
Additionally, when exposed to some of the chemicals in inks and cleaning solutions, the screen becomes difficult or even impossible to reclaim. If you want your screen to hold finer details, use a higher mesh count, dyed mesh, a different emulsion, capillary film instead of direct emulsion, film positives instead of vellum, a better light source, or all of these items. Subscribe online to Screen Printing, the only magazine covering the entire field of screen printing.