I was wondering if anyone has either done or had their aluminum boat's hull restored/polished?  My tracker has developed a lot of discoloration at the waterline along with an overall dull appearence and I'm looking to do something about it over the off season.  Also, is there some sort of sealant for the exposed aluminum?

Look up Sharkhide. They make cleaner and protectant

Tinboats.net they have just about every option on anything johnboats.