Microlite will give you a lightweight cover, and strong enough for RC planes similar to this size only IMO.

I covered a Micro Telemaster with it and the total added weight was just under one ounce(.093 oz). This total weight included one coat of Balsarite over the entire airframe (which I now believe was unnecessary) and, a four inch overlap at the wing center section, top and bottom, to act like some form of wing joiner reinforcing tape, which was another move I wont do again