reading what all the techies have written - they all bare credence - but solving the process is the best possible amswer. to add to the list - someof the board shops are stillusing sr-1000 - thermal cure soldermask - when this mask bleeds - neither persulfate nor peroxy/sulfuric will cure it. i've seen the board shops that use it use a mild bifluoride/peroxide etch. just adding to the list!! rick fudalewski atotech canada *************************************************************************** * 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. * ***************************************************************************