Have you tried Castle Cord yet? Like most good ideas and their originators, it has often been copied but never quite equaled.

The vibrant colours and special weave of Castle Cord make it the finest magician’s rope in the world!
8mm in diameter it does not have a sponge core so is easy to cut and it can be sealed with Superglue.

Available in Red.
Soft and pliable
Sold in 10 metre/32 feet hanks