Hi Steve,
Your root cause for the delaminations is moisture absorption, that is why
baking works. Boards subjected to high air humidity for a sufficient time
will fully saturate (at local ambient equilibrium). The time necessary will
primarily depend on the polymer involved and on the location of the P/G
planes.

Werner Engelmaier
Engelmaier Associates, L.C.
Electronic Packaging, Interconnection and Reliability Consulting
7 Jasmine Run
Ormond Beach, FL  32174  USA
Phone: 904-437-8747, Fax: 904-437-8737
E-mail: [log in to unmask], Website: www.engelmaier.com

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