Measure the area of the repair with the tape measure. Obtain width and height to determine the correct size.
Transfer the measurements in step 1 to a piece of paper. Draw an outline with the pencil and then cut it out with the scissors.
Place the template on a sheet of marine plywood. Trace around the template to create an outline on the plywood. Cut around the outline with the circular saw.
Apply an epoxy to the backing plates or frame of the boat. Place the cut piece of marine plywood in place and secure it with screws using the power drill.
Allow the epoxy to cure for 24 to 48 hours and remove the screws from the plywood. Fill holes with a patching compound. Sand the patching compound smooth with the sandpaper.