Regarding covering a plane with Reynolds Plastic Wrap: that's all I use. It's light, very cheap, and comes in different colors. I've covered three of my DuskStiks with it, a Kestral, and my short lived Tiny. You can use Balsarite but it has MEK in it and smells nasty. I just got some Balsaloc in and would highly recommend it, judging by my initial tests. I'll cover a plane with it tonight and see how it goes.
Reynolds Plastic Wrap is at the grocery store. Use only Reynolds, the other brands don't have the same thermal characteristics.