Aside from obvious concerns like dimensional stability for really high
resolution work, why not use a fresh print on the lightest weight paper
your printer will feed?
Sure, the paper will act as a UV attenuator but it's not going to block
a lot of it. It should let you get a sufficiently uniform exposure for
most work, particularly if you dither the UV source position a bit to
compensate for the slight density variations in the exposed media. Most
resist is a high contrast media, so slight density variations probably
won't matter.
I expect dimensional stability won't be as big an issue if the tool is
used soon after printer.
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Rich Osman; POB 93167; Southlake, TX 76092 (Near DFW Airport)