I had a couple of peeling places on the slideout fabric so tried the awning repair tape a few years back. That stuff did work good. Only thing was, and as Nosticks stated, it only helped a bit because the rest of the fabric came apart shortly after.
Ended up replacing the fabric on the main and the slide a couple of years ago. Was kinda worried i might mess things up but the job ended up not being too difficult. What helped was finding youtube videos showing removal and re-installation procedures.
03 Itasca Sunova, 8.1 Workhorse