I met Jonathan Busse last weekend at the Catskill rodmakers’ gathering, and cast his lines. Very nice young guy, and the lines are all hand furled (he doesn’t even use a drill).
It’s a concoction, I’m sure - I didn’t ask. Felt like a linseed oil mix of some porportion, but that’s a wild guess. He’s worked a long time to come up with a mixture, I know, and his dyes are natural ones. I don’t know but his specifics might be proprietary, although he’s very nice and would tell you that if you asked, I’m sure.