I forgot to say the boat is a 1990 Sea Nymph SS 175 with outboard motor. I removed the rotten plywood. The channel at the bottom edge is 2 1/8" and must also contain the 60 mil thick aluminum skin on the inside. Before removing the drain tubes I slid some wood pieces between the aluminum skins...
I am in the process of removing the plywood transom. Does anyone know the correct thickness? It is either swollen or so rotted that I'm not sure what the proper thickness should be. My guess is 2.00 inches exactly but I'm hoping someone can confirm. I want to replace with Coosa board.
