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

---------------------------------------------------------------------------------
Technet Mail List provided as a free service by IPC using LISTSERV 1.8d
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL
To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest
Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives
Please visit IPC web site http://www.ipc.org/html/forum.htm for additional
information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315
---------------------------------------------------------------------------------