Grant,
I agree with David Albin's post. I have also seen color variations on a
board when I have done ion chromatography testing on bare boards. If only
part of the board is immersed in the extract solution (isopropanol/water,
80C, 60 minutes) that part gets lighter in color and more of a matte
appearance than the part not immersed. It only happens on some kinds of
mask, and then often intermittantly. You may consider it a fabricator
process indicator. I can't answer the conformal coat adhesion question.
Doug Pauls
Rockwell Collins
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