Tin whiskers can break through conformal coating in some situations and the coating process does not always cover the entire surface evenly leaving thin areas or even entirely uncovered places in which whiskers can still form and escape. http://www.freelists.org/post/tinwhiskers/NASA-experiments-c...
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Conformal coating is often used for protection in harsh environments.
http://en.m.wikipedia.org/wiki/Conformal_coating
Tin whiskers can break through conformal coating in some situations and the coating process does not always cover the entire surface evenly leaving thin areas or even entirely uncovered places in which whiskers can still form and escape. http://www.freelists.org/post/tinwhiskers/NASA-experiments-c...