Jacob, If the problem seems related to repair areas, I would reveiw the repair process to ensure proper cleaning after manual soldering. Also may want to change to a no-clean flux. (Doesn't hurt to keep a clean step in process even when using no-clean. If extra flux is needed, flux pens give controlled application) Having all the residues removed is probably more important than coating the rework areas. Since you do not coat the rest of the assembly, I wouldn't coat rework areas. Good Luck Jeff ---------- From: Jacob Mozel To: [log in to unmask] Subject: [TN] Conformal coating Date: Wednesday, January 28, 1998 5:40AM Hi TechNet, I'm working for a big repair lab of cellular phones. For a long time we experience returning of many cellular phones due to corrosion, specially after repairing. I thought about using a conformal coating to protect the fresh solder from humidity and moisture. Does anyone has got an experience in this kind of work and could recommend easily removable coating (we do not seek solvent protection), the application method and curing mode (since there are expected many shaded points, UV or any radiation curing does not seem feasible). Thanks Jacob Mozel ################################################################ TechNet E-Mail Forum 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://jefry.ipc.org/forum.htm) for additional information. For the technical support contact Dmitriy Sklyar at [log in to unmask] or 847-509-9700 ext.311 ################################################################