After washing the screen there are holes in the emulsion surrounding the design.
Always clean the glass to the exposure unit prior to burning a screen and check for scratches on glass. Make sure your darkroom is clean, as dust in the mesh during coating may cause pinholes.
The screen breaks down and/or pinholes develop mid production.
After the screen has been washed, touched up and dried, it’s highly recommended to expose the screen again or place in the sun for five minutes.
The screen has halos or spots in the emulsion that are lighter in color and usually circular, interfering with art or breaking down.
Oil from fingers, dirt and contaminants can leave rings or halos in your coating. These will lead to bad edge definition or premature breakdowns.