FYI, Tenara and PTFE threads should never be used for any "structural" seams in a sail. The thread is too slippery and can come unstitched when under constant load like on a sail seam. You can use it to attach non-structural elements like the UV cover.I may try to do that myself. Since they are older I was thinking of using boded polyester thread instead of Tenara/PTFE thread. There is a huge price difference. Any thoughts?
Bonded Polyester Sewing Thread 16oz. (#138 16oz. - White)
What weight thread would you use for sail and/or UV cover?