I'm late to this discussion, but is it possible that the contamination isn't migrating upward from the board surface, but is instead condensing on the coating surface from atmosphere? Position of the cleaning line, etc., might make this possible. Mike Moninger Thermospray Company, Inc. >>>>Date: Wed, 2 Nov 2005 10:35:42 +0100 From: Ingemar Hernefjord <[log in to unmask]> Subject: SV: [TN] SV: [TN] SV: [TN] Urgent! Acrylic coating Richard, that's what I'm thinking too. Before the coating, the boards are washed in a Vigon machine. I've been suspicious about Vigon 200 before (lots of TN postings) because of it's pH=3D11 value and = uncomplete content declaration (Brian). Nothing bad about Vigon 200 in general, the cleaning works just fine, but there may be special cases, who knows what can be absorbed on the very surface of the boards. How possible Vigon or other residues can pass that tough Humiseal layer in such short a time, I don't understand. All coatings are penetrable, but it ought to be a very, very slow process. That's why we coat the boards. Inge --------------------------------------------------- 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 -----------------------------------------------------