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Topic: How long to keep a screen before exposing it?  (Read 1440 times)
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« on: November 11, 2010 03:17:52 AM »

Hi There
I'm fairly new to screen printing and I need a little help.

I've just covered my screens with the emulsion and left them in a dark room to dry. I've got to go away for a week and won't be able to expose the image on to them and I was wondering how long I can leave the screens in a dark room before exposing them??

Many Thanks
« Reply #1 on: May 30, 2011 11:37:37 AM »

A week might be too long ordinarily but you'll be fine. You want your emulsion to be bone dry ordinarily so if you live in a humid climate a week might be just enough. You don't want to let it sit for too long though because it might start either decomposing or adhering to your screen, neither of which are good things.

You hadn't mentioned it but it came into my head since you're new to screen printing to NEVER EVER let your screen REMOVER sit for more than three minutes. Any longer than that and instead of removing the emulsion you'll be stuck with it forever. I'm very serious about this.
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« Reply #2 on: March 28, 2012 01:42:40 AM »

ive always been under the impresson that as long as the coated screens are left in complete darkness that they can sit for quite a while before being exposed, but the longest ive left them has been 2weeks. there wasnt any problem, but i have a light proof cupboard with a heavy felt curtain covering it.

NEVER EVER let your screen REMOVER sit for more than three minutes. Any longer than that and instead of removing the emulsion you'll be stuck with it forever. I'm very serious about this.

ohnomysweet  - wowza what chemicals are you using? ive never had this problem.

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