Hi Wayne, The kicker is the alkaline etch. If you were using acid etch, usually, the chromates don't bother you much. I don't feel that just a sulfuric acid will get the job done 100% of the time. Some companies are using a acid cleaner with a slight microetch in it to remove the chromates. My preference is to use a alkaline cleaner with a chromate removal chemistry in it, followed by a good water rinse and dry. There are some alkaline etch dry films on the market that are compatible with this type of preclean. Ken Bridges - Morton *************************************************************************** * 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. * ***************************************************************************