While sanding the flat sections of the Didi 40 Cr is pretty easy it is more difficult to get a really fair surface on the curved radius chine so I made up a torture board to the curve of the radius chine. Using a 12 mm ply off cut from one of the frames I attached a 3 mm ply panel the size of a sanding sheet with glue and silicon bronze nails. Being a hot day the fast cure West epoxy was cured in a couple of hours and I attached the 80 grit paper with Sika high strength spray contact adhesive. All that was done between morning tea and lunch.
A big advantage of the radius chine construction is that about three quarters of the length of the chine is a constant 800 mm radius so the curved torture board can be used to good effect along a lot of the hull. The hard backing to the middle of the torture board is very effective in taking off the high spots where layers of paint have overlapped.
The curved torture board sitting on the radius chine of our Didi 40 Cr
The curved face of the torture board. Not perfect but very effective
Our Didi 40 cr hull post curved torture board and washing the dust down with the garden hose.