My point is that your assumption that an unpainted fabric covered aircraft is capable of flight is ABSOLUTELY incorrect and flying a fabric wing with peeling paint is very dangerous.
If you don't seal the weave against the air YOU DON'T HAVE A WING!
Try making a stretched canvas boat without paint.
The ONLY thing keeping a fabric covered airplane in the air is the PAINT. Without it there is nothing stopping the air from just blowing right through the fabric!