The NASA Space Program developed a thread for their use in the '70's that's super resistant to UV rays(which are really intense in the absence of atmosphere, space). Boat canvas and sail makers used it in Houston. It was very expensive then. Maybe it cheaper now? Maybe it was Nomex? It would add years to the life of stitched goods. Maybe Google can find it. IslandJim
I'm an Eighth Day Adventist. On the Eighth Day, God went fishing!