Without covering it with something, the plane is very fragile. I have had 2 planes that I did not cover the fuse. One with a hard landing and the other with a mild crash, every joint in the fuselage blew apart. Literal re-kit. Never had it happen with with a covered plane. Cover with tissue, silk , silkspan, fiberglass, Koverall, monokote, but cover it. I would go with fiberglass and water based poly.