I had bought some black polyester drawcord from DIY Gear Supply a while back for another project but didn't use it after all. I tried it for the purpose you describe, and it worked great on zing it. It has something of a rough surface that really seems to grab well. It has a tiny core like 550 paracord that I removed to help flatten it out. I don't know if it is worth the cost with shipping alone, but it's only $.21 a yard. Yes, a yard! Scott could probably mail it in a regular envelope if you only wanted a small quantity. I have chopped up what I have so much I doubt I have enough to help you.