In a message dated 98-06-11 15:13:35 EDT, you write:

>
>  I am currently testing the Alphametals NR310B no clean, VOC free flux.  The
>  performance thus far has been excellent, with the exception of a slight
>  liquid residue on the boards after the solderwave.  Has anyone had
>  experience with this flux over a period of time?

I suspect that what you are seeing is residual high boiling point solvent.
Water based fluxes need a hotter preheat to drive off the carrier solvents.
If your preheat is not hot enough, you can get the liquid look.  Can also
happen if you are putting the flux on very heavy or running the boards through
too fast - in other words - not enough heat in enough time.

Doug Pauls
CSL

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