clear coating polished aluminum?

[Bandit Ls-1]

Im polishing up an aluminum hood to a mirror finish and wanted to know if their was something like a clear coat to keep polishing down to a minimum, since leaving bare aluminum out in the elements would be alot of work to keep it looking nice. and i dont think normal clear coat will hold up since the clear wont have anything to bite down on and grab since its gonna be soo smooth. any ideas??