Back in 2022, I bought a new-to-us tent - it arrived looking in excellent condition, but it quickly became apparent that all the white portions of the fly were perished. They looked fine, but ripped on very minimal stress, and the rips weren't really mendable due to the fragility of the fabric :-(
I cut it up, and was left with some blue waterproof fabric from the fly, some heavy-duty waterproof fabric from the floor, and a fine mesh from the inner.
What to do with it all?