Phil We have had a similar problem with a potting material wicking up into DB9 connectors. We ended up having to apply RTV to the interface of the pins and connector body prior to connector installation. It was thick enough not wick inside and contaminate the pins. It also sealed the part preventing the potting from wicking in. This took some testing to find the right material for the job but it was well worth it. Perhaps there is a material that is compatible with your process that will accomplish this. Regards, Martin Butcher -----Original Message----- From: Crepeau, Phil (Space Technology) [mailto:[log in to unmask]] Sent: Wednesday, April 05, 2006 1:42 PM To: [log in to unmask] Subject: [TN] conformal coat masking hi, we are using several qss-050-01-l-d samtec surface mount connectors on a printed wiring assembly that is conformal coated with a choice of either an ar or a pur material. the connector pin/header interface is not sealed, so the conformal coating that must go under this connector has an easy path to wick up the leads and contaminate the mating surfaces of the connector. what to do? thanks, phil --------------------------------------------------- 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 847-615-7100 ext.2815 ----------------------------------------------------- --------------------------------------------------- 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 847-615-7100 ext.2815 -----------------------------------------------------