the Alluminum can is a good idea, but as an alternative: mix up some 30 min - 1 hour epoxy, spread it over the affected area, lay a strip of fibreglass cloth over the epoxy and press it in, lay a layer of epoxy over the cloth and let it dry, sand the epoxy enough to get it smooth again and re-cover the wing section, worked when my dads Kadet wing snapped in half