Gary,
Don't clear it unless you want it to look like an average painted tail cone!! You will lose the look of real aluminum in my opinion.

Flite Metal is like a living thing, let it age, it will look better with time. It will also weather on it's own. You can easily clean it off and reapply the chalk if it gets smudged. You will find that just normal amounts of dirt will get caught in the panel lines, this will look really good. I feel for the ultimate metal finish keep sanding it past 1000 grit.

See you at ohio??