Just going to throw this out there: Back in the day of tent camping, we owned a large canvas tent which we had used for about 20 years
It developed wear marks & a small tear at the door zipper 1/2 up the door. We used 2 oval patches almost the same color of the tent. Put one on the inside and one on the outside so the two lined up, and then sewed them in place (I pushed the needle with heavy duty waxed nylon thread through one side, and my wife pushed it back through from the other side...until we were done). Worked out great - we did the same on the other side of the door so it looked like it was specifically put in place by the manufacturer (my OCD in gear again).
We sewed the patches on because all the other patched we ever glued or ironed on to gear never stuck successfully.