Hi thanks for all the ideas.my cross timbers were delaminated and saturated for years of my 78 27ft so I cut the floor out and removed 4 cross timbers and the stink hit me like a punch in the face! The wood was rotted, black and slimy.So now I will make new ones,wrap them in fiberglass in epoxy. Then epoxy them in the hull.that will take care of the problem.just wanted to share that if someone else has the same problem. Michel