The screen may have been exposed to some UV light. When a screen has been coated and sits around too long, the emulsion gets harder to wash out.ī. It’s hard to wash out the image on a screen you just burned.Ī. Too much water pressure can cause the emulsion to wash out and you should only use cold or lukewarm water. Make sure you allow enough time for the emulsion to dry completely and cure in the screen.į.
The lights in your exposure unit may be getting old and losing their potency.Į. If the emulsion is applied unevenly the thicker areas take longer to expose than the thinner areas, so you won’t get a good exposure on the screen.ĭ. The thicker patches may wash out and the thinner areas may be ok. The emulsion may have been applied unevenly. The emulsion was applied too thickly on the screen and not exposed long enough to overcome the thickness.Ĭ. You may have to experiment to get the right exposure time for your equipment and screen.ī.
The screen was not exposed for a long enough time. Emulsion is washing out all over the screen.Ī. Have you remembered to remove the rubber edge protector on your scoop coater? Don't laugh! You’d be surprised how many people make this mistake. Check the shelf life of the emulsion you are using.Ĭ. Keep the emulsion container clean and try to refrigerate it if you are not going to use it up pretty quickly. Your emulsion may be old or have dried bits that have fallen into it. This is especially a problem with wood frame screens once they start to get old.ī. The mesh may have loosened up and have uneven tension. The emulsion does not go onto the screen smoothly and evenly.Ī.
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