After glassing the inside and outside of the stern transom on Sea Minor I noticed the plywood (6mm ocoume) stiffened up a good bit. However, there was a vertical crack right in the middle at the top, and that was not really repaired with the glass plies on either side. It just wasn’t robust, and I was certain that it would fracture again. To remedy this, I decided to add a panel of 1/2 inch plywood to the outside. This would completely fix the fracture, and would give me an option to add a small outboard, if I ever wanted to. This will not interfere with reinstallation of the rudder gudgeons, and the gudgeons won’t interfere with an outboard either.
After it cured, I cleaned up the hard squeeze out with a sander, then mixed more epoxy. I painted the pad and surround with plain resin, then thickened the rest of the batch with fairing compound and applied it to the places where the transitions weren’t smooth. While that was all still wet and gooey, I applied two layers of glass fabric, then left it to cure.
When all of that cured to a green state, I applied more straight resin to fill in the weave of the fabric.