FWIW: In bead work I use Dandyline bead thread by Beadalon which I get from craft stores, label says waterproof and uv/abrasion resistant and while I have never left it in the sun this is one mean thread. The .008" size says 20 lb break strength but there are 2 sizes and 2 colors w and b. Very tough to cut through it. I haven't checked but Wally World might carry it.