Working on my transom rebuild for a 1993 18' Procraft. The original design of the transom had two 3/4" plywood laminated together. The plywood goes from the bottom of the transom area up until it is flush with the top of the hull. However, there is approximately a 1/2" or so gap (by design) that was filled with a rock hard white material between the top cap and hull. Then a strip of angled metal was riveted overtop of this.
I'm curious as what the white material is so I can get it ordered? It was also used at the top of the sponsom area where it came back to the transom, I'm guessing to strengthen the area. Here's some pictures to give you an idea.


I'm curious as what the white material is so I can get it ordered? It was also used at the top of the sponsom area where it came back to the transom, I'm guessing to strengthen the area. Here's some pictures to give you an idea.

