I have a couple amps that have the paint scratched/rubbed off on several of the heat sinks. They are beautiful amps, custom chrome-plated JL slash series. They are in a show-off location, and I'd like to touch up the black that has been removed. Is it safe/kosher to use automotive High Temp Engine black spray paint on those heat sinks to repaint them? If not, please suggest an alternative plan. Thanks.