Freds 73 Scamp restore on a budget

After you clean the aluminum. Before you primer it, you need to etch and seal the aluminum with a chemical conversion coating. Either Alodine, or PreKote. Then add your primer and topcoats. Yes, stay away from the button head rivets. Guys like me hate having to drill em out and replace them when painters sand em flat with a DA sander.
So if I use the Alodine or preKote I don't need epoxy primer just regular primer? or will sealer work instead of primer?
Sorry for all the questions but I really like knowing what to do before I screw up.