Steve Use the Paralene, because the solvents in the PU will likely not improve the dry-film mask, either. Brian "Stephen R. Gregory" wrote: > Hi ya'll... > > Well I've run into a problem again that I've experienced a few times before. > I've got a board (actually 3 boards) here, where the solder mask has come off > all the surface traces. I know what's caused it, it's because of a certain > brand dry-film mask is not compatible with the brand of cleaning chemistry > that we use, the mask starts flaking off if it's washed more than twice I > don't want to mention names because I upset some people last time when I > did... > > The problem is how can I go about repairing the boards. It's a small > double-sided board with some very long lead time PTH resistors on it and > 2-connectors, and as I said, it's only 3-boards. > > The board is hi-rel, and these 3 boards are needed to complete a system. The > board gets conformal coated as a normal part of the process. We spray a > 2-part urethane here, but at one of our other facilities we do have paralene > vapor deposition capabilities. > > I know trying to touch-up the mask is out of the question because as I said, > the mask has flaked-off of all the surface traces. Do any of you have a > opinion as to whether the urethane would be sufficient, or should I use > paralene? I tend to think that paralene would be better because of it's > strength and ability to coat all surfaces well. > > -Steve Gregory- > > ############################################################## > 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 > ############################################################## ############################################################## 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 ##############################################################