This thread

biggrin

has caused me to rethink using Tenara or PTFE Lifetime.
When I started sewing with my LSZ1 in 2016 I looked at the Sailrite info on Tenara, Profilen (now PTFE Lifetime) and polyester V92. I went with polyester V92 for ease of the learning curve of sewing.
Most of my sewing projects have been repairing UV damaged zippers, dodger windows and some restitching of the dodger, bimini and sail cover that came on my boat.
My canvas comes off the boat in October or November and goes back on in May so a lot less UV exposure than sunny CA or FL so repairing existing canvass with PTFE Lifetime sounds like overkill.
But now I'll give some more thought to using PTFE Lifetime thread on my projects that will see the most UV and I'm building new out of new canvass.