After considerable thought, we have decided to go with the water soluble
spacer idea.  By the way, to answer some of your questions, the substrate
we are using is a ceramic substrate, we are using a water soluble flux, and
we use aqueous cleaning.

*Paul, if you are going to use water soluble spacers, you will want to
monitor your sump more often and step up your preventative maintenance.
The dissolved spacer material tends to re-deposit where you least want them
to, as well as building up on the walls of your cleaner, as well as the
walls of your plumbing and pumps.  It doesn't just "go away".  Make sure
the dissolved material does not come back to bite you.

Doug Pauls
Rockwell Collins

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