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Quote: Originally Posted by RichardGreaves Test the room with the window. Put a coin on a sacrifice stencil that is exposed to window light every day. When you've had enough, wash out the stencil and you will see how many days it takes to change your stencil. Perhaps your window doesn't let enough UV-A light into the room to expose your stencils Many screen makers have covered their windows with UV stopping films like Rubylith or Amberlith. Perhaps a curtain would help, or a cloth over the screens.

After a little more research, this was what I was thinking. Putting a good UV coating or film on the window along with all the bulbs in the room.
I was thinking of a cardboard box, and the screens put into a black bag and then inside the box.

Thanks for all your reply's it's really helped.

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