EBEACH,
Don't know what you were using for a mosture meter, but the GRP meter will find moister penetration in wood or synthetic coring material. It will find moisture if water is trapped in a section of the hull. Check out
http://www.jroverseas.com/modelgrp.htm for specs. This is what the insurance, warrantee, survey, and manufacture industry uses. It is the best way to evaluate water penetration in any material. It only looks for water, and can see 'thru' glass.