I bought my J-30, a 1981 model, #363 in 1986. It had not been properly calked and I discovered an area of about six inches of delamination around each of my chainplates. I chose to repair the problem from inside the boat and keep the deck intact. I cut out the rotten balsa and sealed the area with epoxy. I filled the void with marine plywood sealed with epoxy and used west system to all the voids. I finished the head liner with kitchen counter type laminate to cover the area that I had cut out. I also injected epoxy into the bulkhead at the chainplate attachpoint area. It has held up great through the years. I too, recalk (if neccessary) each year.
