My '75 C22 has.............
My C22 had some delamination in the forward port dinette locker, and still has some in the rearport dinette locker. I had to cut out the delamination with a cutter wheel to dry out the area and repair the damage. It was caused by an improperly sealed thru-hull knot meter that leaked. The center portion of the inner hull has a fiberglass skin, over a 1/4 inch thick plywood stiffener. The plywood is glued to the inside of the bottom with about 1/4 to 3/8 inches of some type of plastic cement. The total thickness was about 3/4 inch at that area.