replace if possible
Hello David, I restored an O'day 23 1973. If the boat is on the hard, then I would suggest "bite the bullet" and replace. It seems monumental I am sure but in the end you will be happy knowing all that old stuff is gone and all the hard work was for new. I am not sure If I took all the time to sand,and sand, wipe, tape,scrape, and glue or paint and sand that I may not be satisfied the old was gone and would not peak out sometime later. I used a marine grade plywood with 9plys to replace. Very ridgid,heavy,and clear. We laminated a beautiful "like teak" laminate on it. With it seated in the liner groves and with all the screws, it has proved to be an outstanding improvement. The best thing is all the old will never come back. It may prove to be a bit more challenging if the boat is in the water. Good Luck, James