I have bought a North Face RoadRunner 3 tent 10 years ago. It is a great tent, and it served me well during a 9-month trip to South America.
The problem is that the transparent part of the rain cover - the so-called "window" - has disintegrated, and now there is a nice hole instead of a window:
Other than that, the tent is perfect.
How do I patch the missing part? I don't it to be transparent, just water-proof.