Gordon, Your questions are pretty vague as it is very complicated to perceive the level of various individuals capability of learning. I am positive you will receive suggestions from others so good luck with that. I suggest though, if you are referring to conductive soldering, what I believe is exteremly important for you to know is the following information. The required time for training one to work with low residue, no-clean flux is very dependent on the particular solids content, formula and even brand of flux chosen. Many different brands of flux, even those marketed for usage with hand soldering or rework have radically different responses to the abrupt temperature change from conductive heating. I also find it asinine some low residue fluxes marketed for rework, utilizing conductive heat, also call out in the technical data for the flux to be preheated at specific temperatures for allotted time durations. Sorry, this is just not done in the conductive soldering process. Choose your flux wisely!!! This would be through an evaluation process comparing the capabilities and reactions of various fluxes for the soldering operation. Not necessarily what the circuit board production production oven uses. Of course you have component solderability, flux compatibility, and other issues to consider. Do the evaluation!!! Good Luck. Marshall Canaday Pace Inc. Applications Engineer / Training Specialist [log in to unmask] 301-490-9860 *************************************************************************** * 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] * ***************************************************************************