I saw some Star Brite the other day when I stopped by a place in Mansfield, TX. I went the the manufacturer (AmerimaxBP) and they said I would have to go to Texas Aluminum down the street as they didn't sell direct to the public.
Texas Aluminum had some of it and it is mainly a covering as it is pretty thin. It would work as a covering on the front but it you want to make running boards, you should buy the real plate so you can actually step on it.
StarBrite is made of a light gauge polished aluminum with an embossed tread plate finish to replicate that of heavy gauge steel tread plate at a fraction of the cost.
http://www.amerimaxbp.com