You can do it your self I bought a small unit from caswell that works nicely . I had a almost new digital oven that was all ready in my shop used for other things. I am not sure if you can get a rim in it. But I have used it for other things like my intake manifold. It was aluminum off a race bought so it did not look very good. Tossed it in the bead blaster, then sprayed it wet black and bake for 10 minutes. Looks great and will not peel.

1962 Chevy C-10