My Humongus, built by Emil Kovak, had an all clear doped finish, applied by brush. The fuselage and topside of the wing was like glass, after sanding with progressively finer sandpaper down to 2000 grit. The bottom of the wing was left unsanded, and showed where it started, before sanding. PW took a good look at it, and he was amazed. PW also flew it once, and it was my turn to be amazed. OBTW, Emil claimed there were 8 coats of clear Brodak dope on the model. Probably not thinned a lot. When I crashed it, a piece of silkspan seemed very thick and stiff.
The last crash took the LG off, which damaged the stabalizer as it went by. The wing sorta split along the LE & TE, horizontally. I've fixed a lot of busted airplanes, but I was clueless as to how to fix this damage. I crashed out of the second vertical 8, when turbulence from the trees at Ft. Dent park hit it. I lost line tension, got it back, attempted to complete the V8, and lost it again. I guess I shoulda pulled out inverted or half outside looped back to upright. I still don't like doing the V8...
Steve