That's a question I've been wondering also. I seem to remember that IPC SM 840 has a provision for touch up as long as it meets the requirements stated herein - or something like that. I checked with an overcoat pen manufacturer and was informed that it was only an acrylic based coating that was tinted to match solder mask, not qualified to IPC SM 840. Acrylics generally have low solvent and mechanical abrasion resistance ... Mike Sewell ############################################################## TechNet Mail List provided as a free service by IPC using LISTSERV 1.8d ############################################################## 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 ##############################################################