Looking for a rubber coating for twisted wire?

I make my own thin twisted triple cable by twisting thin (7/0.1) wires together. It works but the wires are prone to unraveling. What I'd like to do is, while I've got them stretched out and tightly twisted, apply a liberal coating of something that would bond them together but retain flexibility.

I've tried silicone RTV potting compound but it isn't very strong, it's a dust magnet, and its friction is too high which makes it hard to handle. I need something that will set to a smooth, low friction, flexible rubber.

Can anyone suggest a solution?