More than likely, there is a film on the board and the
resist is not bonding to the board. Probably, it's
whatever your using to clean it with. I use comet or
ajax to clean scrub the board (This ensures fresh
exposed copper...). Then I wash with water to remove
any cleaner. I then wipe it down alcohol to make sure
no residues are on the board. At this point, I use a
new (And therefore, clean) paper towel. At this point,
I apply the resist.
Throughout this entire process, I wear latex
disposable gloves so that I do not inadvertently apply
my finger prints to the board.
YMMV, but it works for me every time.
Best regards
Marvin Dickens
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