I have used the Brodak heat shrink covering on three models over the last 2 years. I really like it. It holds dope and seals very well. I use it only on the wing with open bays. I would not use it over a sheeted fuse. The best thing about it is that it is easy to remve wing warps with it. Just use a monocote heat gun, twist the wing to a true position, then gently heat the covering and presto; the warp is gone. I have used it on a Ringmaster, an OT named 'El Diablo' and a Veco Thunderbird. It may be slightly heavier than silkspan, but not by much.
Tom Weedon