I tend to reuse my screens multiple times over for my prints and sometimes the images start to deteriorate as some of the photo emulsion starts to erode and wash off. There is a really simple solution to touch up these images: screen filler
I use a small detailed paint brush to apply screen filler into the areas where the emulsion has started to disappear to clean up my image:
Another problem I run into: the glass I use to create my prints is slightly smaller than some of my larger screens so a small amount of light is diffused leaving a faint line in the final image:
When this happens I just use screen filler to touch up the image:
You can also use screen filler to free hand a design onto a screen. You would apply it anywhere you don’t want ink to pass through. Happy printing!