Hmmmmm, 
I wonder, in your application, if you are treating a symptom by going to the
silicone conformal coating, rather than the cause of the failure.  How do you
know it was due to the coating.  We have worked with several customers in
high power applications.  If you have excessive residues on the board surface
in the area of your power leads, you can get leakage currents, which cause
dendrites, which arc when completing the short, which carbonizes, then the
cycle repeats until a large charred area is formed or worst yet, a fire.
 Something to think about.

Doug Pauls
CSL

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