I've got a cervini stalker hood, and i didn't drive around with it on, or cook, or bake, or weather, or anything.
It fits great, looks great, but I did notice that I can now see just a tad of some fiberglass fibers rising, kind of the fiberglass texture. It may be a good idea to weather it first. It isn't bad, and I'm sure i'm the only one that's ever noticed it. I have to look close, but I still notice it.