My 12' of 2275 arrived today, it's not nearly as clear as 3603 but if it has the longevity claimed then it's what I'm looking for. It's also quite a bit stiffer than 3603, I think people get better bends out of 3603 than they will with this stuff.

I'll get pics up soon and when I rebuild my loop (pending metalwork) I'll post filled pix.

@serial- it feels like it probably is polyurethane, I don't have the lab equipment to determine it's makeup though. ...And no, before you ask, I'm not going to go dunk it in acetone to satisfy your curiosity. You can buy some and do that test your self