In prep for final primer (White), I started the grueling process of block sanding the entire underside of the airplane. I could have just used a DA sander but knowing this is the last time I will be block sanding the belly, I wanted to make certain she was straight and true. I will say, a few VERY slight low spots and high spots showed up when blocking so I won't need much filler. However, the sump repair is quite the elbow grease job for sure. More micro to come. I also installed the lower cowling and began to fair the fuselage and cowling lines together. Again, not needing much micro, so it should turn out really nice.