This has been one of the most discouraging parts of the entire build. Fill, sand, fill, sand, fill, sand... Great volumes of dust, sweat & sore fingers. And each time I think I'm close, I find another area needing another dab of filler. Which has to be sanded. I think (HOPE!) I'm finally getting close to the end on the fuselage. A good going over with some fine sandpaper and I'll start masking in preparation for primer.