Worked on my first large-scale use of hard-mache to smooth a roofing surface composed of irregular triangles. Used about 5 gallons of mache to put a first coat on the small structure that covers my firewood.
It went well, and the new surface is definitely more rounded and smooth. A second less-rough coat of "finish" mache will go on in a few days; after this coat has a chance to dry.
The following two photos of a test piece provide some sense of how the finish coat will go over the rough coat, and then on top of everything will be a layer of waterproof mastic.