Hi to all, Has anyone ever dealt with a "water like" staining pattern on solder mask surfaces processed through HASL? We suspect the SM cure cycle since rebaking the boards makes the stains disappear. The stains seem to be within the solder mask (Probimer 77) and only appear after the HASL line. It also seems to hit high heat mass boards worse. Denis Dionne Coretec ############################################################## 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 Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ##############################################################