Done a few! I use S/S wool to break the surface then apply 2 coats of zinchromate primer, the paint I do 4-5 thin coats waiting just long enough for it to get tacky between coats. You want good coverage without runs, notice the stainless steel wool never use steel wool the paint will blow in shore order from corrosion also if you sand use ONLY aluminum oxide paper most all others will also cause corrosion. It is also very important to prime as soon as you clean the surface, aluminum stats corroding almost immediately! You may not see it but it is there, the slightest bit left behind will ruin your job!
No matter what your beliefs are "GOD BLESS AMERICA"
Fully retired marine tech near 60 years in the biz.