I would suggest not using such nice stuff like silk or cotton if you're just going to resin coat it. After you spend all that money on the ito and then it's resin coated, might as well just use polyester or nylon lacing. It will actually absorb the resin more evenly and make the handle look more uniformly colored. Still a few beautiful job Chris. You can buy polyester or nylon flat braid cord for like 35 bucks for 144 yards + 10 bucks shipping handling. Just my 2 cents. Very excellent and beautiful work you do. Oh and since it's basically made of oil, you can pretty much make the end knot of your japanese wrap look like it has vanished with a piece of metal rounded end and a mapp gas torch.
If you haven't already tried it, West Systems Epoxy is da bomb and works very very well. 105 resin with either 207 or 206 hardeners. 207 isn't that great for white colored cord as it cures amber, but on black, blue red, etc etc, it looks great. Plus when that stuff if you've only put a coat on, it appears as if nothing is on the tie at all. might also work for the silk wrap better.