I know sweet nothing about paf covers and Spence is the man to ask. He has done me 2 in the past year and both were awsome. But back to the question, Nickel was cheaper than chrome allthough I thought the first ones were stainless but I may well be wrong. Polishing Nickel is no prob with a decent size wheel 10/12 inches at about 6000 rpm. Take out any hickeys with wet and dry down to as far as poss and then a soft airflow/waved wheel and white st/steel buffing compound. Mirror finish that yellows nicely after a while. Nickel will plate straight on if the cover is polished well and Bright Nickel is only an organic brightner added to the tank during the proccess.