I have a Kelty Noah 9. This tarp hangs in a diamond. I have the guy lines that came with it on the ridge and the two main side tie downs. Then I have mason line whoopies on the ends to close it up really tight. I'll see if I can put it up this weekend and get some pics. Ohhhhh I may have a pic already, I'll have to do some checking.
I'm a member of PETA!!!!
Braided nylon mason line has a BS of ca. 150 to 170 lb, so should be adequate for guy lines and probably ridgelines in many cases.
It may not be rocket science, but it's still science.
Yes, go to a kite supplier for braided Dacron(tm) = polyester line. Per weight it is 30-50% the strength of dyneema /spectra. It doesn't stretch and doesn't absorb water.
We could go on and on about minimal UV resistance, probably not included in 150lb test line available for $.025 /ft = $.08 / meter.
"Mason's line" could be about anything, the reason there are different reports about it. Let's wake up to the fact that it is not made to be load-bearing. That it might bear any weight is incidental to its use in construction.