Clear Coat wont stick to the Aluminum very good. Id skip the clear coating and just polish it up. You need a metal etching primer with a base coat of color for the the clear to stick.
yh but if i decide to put graphics on later i can always put an extra coat of clear coat it wont make a diffrece and yh im not to sure if they would look good i would need to do something really cool for them if i was to get some