[Briguy]

George,

I saw a seacast transom being poured. It was somewhat easy to mix and pour. The next day I was surprised to see it had cured and shrunk leaving 1/8" gaps on both sides of the transom. I would stay away from it myself. It's sooo heavy too. Wood will last you 20 years and it is proven. If I was doing mine over, I would stick with corecell or structural foam and glass. It would be light and stiff and waterproof.