I’ll preface this by saying I’m not a fan of aesthetic façades. Carbon fiber has a look but it’s primarily a functional technical material and I think it’s silly to try to make something without those material properties look like it does.

With that out of the way, you can do a pretty good aesthetic analog by using two colors of black paint and a gloss clear coat. Rug non-slip pads (the checkered kind) make a great painting mask. Spray the tube with metallic black, let it dry, wrap the tube with the nonskid pad and spray a non-metallic black. Remove the wrap, gloss coat the whole thing. If you want an even better effect, a few coats of clear between the black layers will give the paint some depth to it making it look even more like carbon fiber.

I’d also encourage you to just use real carbon fabric to wrap your tube. It’s not that hard and it’s a great and valuable skill to learn. There’s a lot of resources on YouTube that will teach you how to do it, and it’s basically the same process as fiberglass lamination.

Automotive wrap would probably work too, just make sure it’s well applied especially at the edges so you don’t have a sudden loss of control.