I've used diamond mylar in the past. I wrapped a custom clone "tent" frame with it. I also used it to line the back wall of my greenhouse at the last place I lived (the greenhouse faced south, and the back wall was that of another building).
I bought a 100' roll of it a few years back, and still have about half left for any other projects I might get into.
It's durable and it does what it's supposed to.