I use thin solder for coiling rope, granted it doesn't contain "strands" but when painted it passes for "line"(sailor man talk for rope) Solder is easy to handle and if you coil it or flemish it, it stays put...solder also comes in handy to represent electrical cable and hydraulic lines, again the scale of the model dictates if it looks "scale" or not.
If using thread, Big Jakes "wax method" is very good. Another method for waxed thread..take the thinnest sheet plastic from Evergreen Products, and using waxed thread, start coiling the thread by super gluing to the plastic sheet. Then turning the sheet and guiding the thread in a circular motion spot tack it to the sheet, until you have your coil in the size you desire. Then using scissors, trim the plastic sheet until it's even with the edge of the thread coil. Take some deck gray(or whatever color you're painting the deck with) and touch up any exposed white plastic so it blends with the deck. Then take your coil and glue it to the deck! It takes a little practice but the beauty of it is that you build it off the boat and if you screw it up, glue won't damage the model. Applying the glue is important, too much and it "colors" the thread strands, practice and experiment first. You can also use Elmers water base glue if attaching the thread to aircraft veneer(thin wood for R/C plane models), it cleans up easy with water, again practice, Elmers dries slower than super glue.
Good luck!
Mike M.