I have a 1986 Ericson 26 w/ a composite type rudder. It is delaminating. The area of Delamination is about 8-12" by 14-18" on one side of rudder only. It is a foam core rudder with a plastic skin. I cut a small area open to investigate construction. It looks as if some water collected in rudder and expand/contracted w/ weather exposure. It looks like the foam seperated from itself. It is currently dry-docked and has been for past two seasons. Please advise on repair, Glue, fiberglassing... or possible replacement? Thanks- Jon