It sounds to me like the coating thickness of the solder mask is too thin for the circuit heights that you are trying to coat. Try increasing your wet weight coating thickness. >>> "Todd Rogers" <[log in to unmask]> 01/02/97 06:53pm >>> Technetters, We have been experiencing some sporadic problems with soldermask being burned off the edge of the circuits at the hot air level process. The soldermask on the knee of the trace seems to burn off and allows the solder to stick to the trace edge. We are using a chemical clean process prior to soldermask, and are spraying the soldermask on with a Teledyne spray coater. Has anyone else experienced these problems and what did you do to fix it? Todd Rogers PC Boards, Inc. [log in to unmask] *************************************************************************** * TechNet mail list is provided as a service by IPC using SmartList v3.05 * *************************************************************************** * To unsubscribe from this list at any time, send a message to: * * [log in to unmask] with <subject: unsubscribe> and no text. * *************************************************************************** * If you are having a problem with the IPC TechNet forum please contact * * Dmitriy Sklyar at 847-509-9700 ext. 311 or email at [log in to unmask] * *************************************************************************** *************************************************************************** * TechNet mail list is provided as a service by IPC using SmartList v3.05 * *************************************************************************** * To unsubscribe from this list at any time, send a message to: * * [log in to unmask] with <subject: unsubscribe> and no text. * *************************************************************************** * If you are having a problem with the IPC TechNet forum please contact * * Dmitriy Sklyar at 847-509-9700 ext. 311 or email at [log in to unmask] * ***************************************************************************