Roger kindly shared this tip for making barbed wire:

“I wanted a small section of barbed wire on a fence, so used some fishing line and tied knots in it. With a little trial and error, I cut the knots so that tiny bits stuck out to make the wire barbs. I test sprayed a length in silver and touched up some areas near the barbs with brown and rust-colored paint. There might be other ways to do it, but mine after weathering looks real and was cheap and easy to make.”