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reuse screen

 
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Old 1 Week Ago Oct 2, 2019 6:32:59 PM -   #1 (permalink)
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Default reuse screen

I've wasted 2 screens on trying to get my exposure time down. If I want to use for the same stencil, can I just reapply emulsion over what's there or do I have to clean them completely?
 
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Old 1 Week Ago Oct 2, 2019 7:40:15 PM -   #2 (permalink)
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You should definitely recoat.You might only be able to get away with it if it's a one colour but it's risky as far as the consistency of stencil thickness.
 
Old 1 Week Ago Oct 2, 2019 10:18:41 PM -   #3 (permalink)
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Default Re: reuse screen

Clean off completely with emulsion remover.

And note that you can permanently lock up screens with improperly exposed emulsion that is then exposed to cleaners and ink etc (or if you let emulsion remover dry on screen).

But most importantly, quit wasting your time guessing. Do a step wedge test. Google it and/or see the link in my sig. Most beginners have a weak UV light source, so try to keep the coat of emulsion even and not too thick. Also ensure that it dries well. If your humidity is over 50%, you will need a dehumidifier and/or some heat. Emulsion that is too think may never dry all the way through. Undried emulsion does not cure, and can become permanently locked to the screen when exposed to ink and cleaning chemicals.
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