Fully sheeting a wing with balsa sheeting is something I really have not tried. After the wing is fully sheeted and sanded, how have you finish the wing? Example: Prime and paint over the balsa?, cover the balsa with something like Mono or Ultracote, Dope and polyspan over it? Just looking for some tried and true ways.
Dope and silkspan, or dope and carbon veil. There have been many attempts to do away with the silkspan, etc, but it usually doesn't work out too well, with the grain coming back in a few months.
If you are going to use heat-shrink like Ultracote, DO NOT dope it or put anything on the surface. Sand it smooth, vacuum and blow off every speck of dust, and then just put the covering down. Treat it just like an open-bay wing, pull/stretch it smooth, adhere at LE and TE by diagonals working your way from the root to the tip. Tack it at the root and tip, then shrink it with a heat gun to get all the air out. Then, take a soft cotton cloth with a very smooth surface (like an old t-shirt wadded up, but a smooth working surface, and then heat and gently rub the covering down to adhere it all over. Then make a complete attachment at the root. Use the loose material and heat and stretching to cover the tip, then stick that. Never ever touch the middle of the surface with an iron, the heat gun and pressure will stick it everywhere to the balsa. This is critical to avoid both leaving marks where the glue has adhered heavily vs not, and to keeping it from wrinkling in the sun later.
Monokote will last about 5-10 years before it starts to become brittle from UV, after that, anything might happen, but it generally will start to crack or powder up. I don't know about Ultracote. Do not use monokote if it is not soft on the roll. The outer turns tends to get "crinkly" just sitting on the roll, it is supposed to be pretty soft.
You don't need any of the "heat-sealing" adhesives, etc. The adhesive on the covering is fine as long as you get it hot enough to flow and the surface underneath good and clean.
Brett