Then more sanding, which revealed the spots I missed with the filler.
http://www.***boat.com/image_center/...29floors13.jpg
After some more filling, another couple of coats of PolyPrime, and lots more sanding, I was ready to start on the tops of the tunnels with the DA and 80G.
This is what they looked like when I started:
http://www.***boat.com/image_center/...729floors1.jpg
http://www.***boat.com/image_center/...729floors3.jpg
The tops of the tunnels were poorly done from the get go, as you can see in the photo. They took a week of evenings sanding with the DA, trying to get them flat and smooth. Then, another three nights of sanding by hand with 220g, to remove all the scratches and swirl marks from the DA. I started getting into the top layer of glass cloth in some areas, so I decided to stop sanding any further, even though there were still some low spots.
http://www.***boat.com/image_center/...29floors12.jpg