Once the hull sides cure into place, we remove all of the screws (about 500 total) and fill in the holes. We also fair the hull sides to the backbone. Then comes the dreaded sanding. Though the sanding is not difficult, it is time consuming to do it right and get everything smooth.
When mixing up the epoxy fairing compound, it gets small air bubbles which become exposed during sanding. So another batch of fairing compound gets mixed and applied over the existing work just to fill in the pockets left by the air bubbles. Of course it has to be sanded again.