We used an acryate based masking agent from TechSpray that had a built-in UV sensitive material. You could quickly inspect the coating under 'black light' for completeness of coverage, then after cleaning for completeness of removal. The neat part was the lower contact resistance after cleaning, as it seemed the coating pulled any co-deposited organics from the gold plating out of the gold finger coating so they were removed during cleaning. (All data reported in a NEPCON West technical paper a few years ago; reference can be sent to interested folks.) Check their web site, to check on current formulations and availability. Bill Kenyon Global Centre Consulting 3336 Birmingham Drive Fort Collins, CO 80526 Tel: 970.207.9586 Cell: 302.377.4272 --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 1.8e 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 or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 -----------------------------------------------------