Jason - You mention that the traces are tin immersion plated - have they been fused or reflowed in any way? Straight tin plate often loses its solderability very quickly after plating resulting in conditions similar to what you describe. I'm not a real proponent of immersion gold over nickel, but this may very well be one of those cases where it should be considered. Or, as an alternative, one of the white tins: FST from Dexter; or Omikron from Florida Cir Tech. Regards - Kelly ############################################################## TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c ############################################################## To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TECHNET <your full name> To unsubscribe: SIGNOFF TECHNET ############################################################## Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information. If you need assistance - contact Gayatri Sardeshpande at [log in to unmask] or 847-509-9700 ext.5365 ##############################################################