No Sir, when you pull everything apart I would still put at least two layers of 1708 over the "raw" Arjay/Seacast. I would go more to the "lets overbuild this thing" side of the project. If you build your mold 1/8" less thickness of the final inside/outside measurement then you can add the 1708 and fairing to even everything out. Let's say your inside transom thickness is 1 1/2" and outside of the fiberglass transom is around 1 3/4" thick, you want to make you pour 1 1/2" and make up the difference to the 1 3/4" with glass. Make sense?
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