Still no sander available to continue sanding the hull, so I sanded the edges and joins on the already-sanded port half of the hull to remove brush marks.
I wasn't quite careful enough though, and sanded through in numerous small patches. I marked them all with a piece of tape so I would be able to find them again after touching up with more primer, and then applied the first touch-up coat.
Here is part of the starboard cockpit.
And here is the rub rail near the bow.
I think it will require several coats to hide the patches completely. Oh well...