This is a perfect application for vacuum bagging, but yes, use a notched spreader on the cabosil and apply it to still-wet layer of 1708; mat may add some extra bulk too, although not much strength. When we installed the transom in SkipnCarla's 21, we were advised by a professional glass guy to drill some holes in the coosa to allow it to squeeze out and show that we weren't getting air pockets between the coosa and inner skin. Bolted 2x4's or clamps are definitely a good idea.
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