Whatever you choose to use, make sure it is not FLAMMABLE before you spray it on.
I have seen a car catch on fire because of flammable dressing that was sprayed under the hood. And before anyone asks, it was not me that did it.
Hey Rollin where did you get that engine cover?
I took it to a company here in St Louis. They do a spray on chrome for plastic. They have been out of business for a few years now. I will be selling it in a year or two. I have ideas for a new plenum cover to match the new paint job.