Visit your local Harley-Davidson shop and pick up a can of their wrinkle black spray paint. It is the same thing Mother Motor (H-D) uses on the engine and cases of all their bikes with black motors. It looks fantastically black with no reddish brown like most high temp paints. It wrinkles best on warm parts(around 200Â°-225Â°)and should be applied in a medium-thick coat. Ask the service guys how to apply it, since they should have a few pointers.