We decided to modify the transom drains on the 2003 CD 25 since I was adding an outboard bracket and swim step, which would make access to the flapper valves a bit more difficult. Photos of the before and after are in the last of the Thataway album.
The bored hole had rough edges coated with gel coat. There were some voids and rough edges, but no water intrusion. We used a drum sander and cleaned up the plywood. As we did minimal sanding, it became evident that there was a crack in the joint between the aft floor of the cockpit and transom, which was devoid of glass; We cleaned this up, and laid in multiple strands of glass fiber with epoxy to fill the void. We then put on two layers of 10 oz glass cloth with epoxy--as well as coated the hole in the transom, and laid 10 oz glass around the circumfrance of the hole. The glass over the crack, was laid into the hole so that it was attatched to this part of the transom secondarly. Several more coats of filler and epoxy smoothed the transom hole and it is now totally water proof.
The bored hole had rough edges coated with gel coat. There were some voids and rough edges, but no water intrusion. We used a drum sander and cleaned up the plywood. As we did minimal sanding, it became evident that there was a crack in the joint between the aft floor of the cockpit and transom, which was devoid of glass; We cleaned this up, and laid in multiple strands of glass fiber with epoxy to fill the void. We then put on two layers of 10 oz glass cloth with epoxy--as well as coated the hole in the transom, and laid 10 oz glass around the circumfrance of the hole. The glass over the crack, was laid into the hole so that it was attatched to this part of the transom secondarly. Several more coats of filler and epoxy smoothed the transom hole and it is now totally water proof.