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Nida bond and Seacast are great products but before you choose either as the solution to your problem be sure to consider the added weight of the products first. Plywood weighs if I remember correctly 4.7 lbs a gallon. Seacast and Nida bond weigh 7.1 lbs a gallon. I added 20 lbs to my transom using Nida bond and I felt that my boat can take the added weight so long as I stay with a classic two stroke motor. Yours being a much larger boat, you might have to take into consideration the weight of a modern four stroke. I can tell you this much though, my transom is as solid as a rock and i don't have to worry about sealing the bolt holes or splashwell drains.