Well, actually the silkspan on balsa with polyurethane is exactly that..... on balsa..... it doesn't do very good on open bays. But it is gangbusters on sheeted areas.

I used to do my solid sided gliders' fuselages with glass cloth to the front and SGM from there back. And would have sworn that the rear was as strong as the front. And the rear was a bit easier to sand smooth.

And btw....... I liked your idea so good, that this morning went down the creek looking for cat tails. Gotta admit that the trip was educational. Found out they don't grow around here and that copperheads are already out. And that I'm not as old as I thought and can run as fast as I ever did..... grin..... just not as far.........

Nah, just kidding.... I didn't run nowhere. 'Cause the copperhead beat me to it. Guess old guys must smell bad or something.