How to patch a silkscreen in screen printing. This video the solution of silk screen scratches.

There are several habits to create a stencil for screen-printing. An early way was to make it by hand in the desired shape, either by cutting the design from a non-porous fabric and attaching it to the bottom of the silkscreen, or by painting a negative image in a straight line on the silkscreen with a filler material which became impermeable when it dried. For a more painterly technique, the artist would choose to paint the image with drawing fluid, wait for the image to dry, and then coat the entire silkscreen with screen filler. After the filler had dried, water was used to spray out the screen, and only the areas that were painted by the drawing fluid would wash absent, leaving a stencil around it. This process enabled the artist to incorporate their hand into the process, to stay true to their drawing.

Screen_Patching A technique that has increased in popularity over the past 70 years is the photo emulsion technique:
1. The unique image is created on a transparent overlay such as acetate or tracing paper. The image might be drawn or painted directly on the overlay, photocopied, or printed with an inkjet or laser printer, as extended as the areas to be inked are opaque. A black-and-white positive might also be used (projected on to the silkscreen). However, unlike traditional plate making, these screens are normally exposed by using film positives.

2. A silkscreen must then be selected. There are several different mesh counts that can be used depending on the detail of the design being printed. Once a silkscreen is selected, the screen must be coated with emulsion and let to dry in the dark. Once dry, the screen is ready to be burned/exposed.
3. The overlay is placed over the emulsion-coated screen, and then exposed with a light source containing ultraviolet light in the 350-420 nanometer spectrums. The UV light passes through the clear areas and creates a polymerization (hardening) of the emulsion.
4. The screen is washed off thoroughly. The areas of emulsion that were not exposed to light dissolve and wash away, leaving a negative stencil of the image on the mesh.

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