In reply to Alphin:
Thinking about your question:
My idea is to:
Buy a good make tent.
Use Fabsil Gold (Grangers) when needed for reproofing the outer tent.
Put your tent in the shade; UV is the tents enemy.
Use for the problem of delaminating of the ground sheet, McNett Tent Sure or similar.
Use Seam Grip or the like for tape that comes off,
MCNett Seam sure if the tape comes off on longer stretches. Use your own brush, the one that comes with it doesn’t do the job.
Zipper problem: only the Hilleberg … use T-ZIP as lubricant … (as said buy a good tent).
Look on the internet about service and what others say about the quality of their tent (after they have used it).
Here my experience:
Had a Salewa tent Hiebler style. Lasted for 30 years. Used in the first 5 years nearly every weekend and long vacations (also in winter), after that now and then. RIP since 2013.
A Sierra designs tent? Still in use in Canada?
Then a TNF VE25 in (1996) still in use. Had to reproof the outer with Fabsil Gold, using it still 2 weeks a year.
A weekend TNF tent (1997) Cirrus. Did last at least 10 years, say 4 weeks per year. Several reproofing’s of the ground sheet and outer. Fabric got weak. RIP in 2013.
A TNF mountain 25 (2000) still in use, though no frequent use.
Bibler (2002) had to re-glue some stitching. Use it now and then above tree-line and high altitude. No problem.
Hilleberg Keron GT (2006) using it every year 3 to 5 weeks. No problem.
A Eureka tent (2007) I think Susten? Used two weekends. Not my tent.
A REI Quarter Dome (2008) nice and light. Delicate, but good quality, still in use.
Hilleberg Saivo (2013) used 4 weeks at high altitude … fabric is very okay but … the quality of the stitching is not like that of the Keron. Way too expensive for what you get, in my opinion.
A Kelty Tarp which last forever (over 15 years). Use it for nearly all car camping.
A MSR Hubba NX. Going to use it on bike trips. No idea.
Delaminating happens. For me most of the time with TNF stuff bags and some older heavy used MEC stuff.
In the end I would say: take your losses, don’t waste all your time reproofing a tent that is a dead horse. Get a new one and go climbing.
Happy trails.