I used some of the Firstcall material on a wooden framework and it worked well up to a point. My house faces south and when the sun shines on the house, my darkroom which is in the spare front bedroom, shows a faint visible glow through the material from the sun. Otherwise it is light-tight
I used the remaining material I had left over to cover the other side of the frame and that now makes sure that there is no light seepage.
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