First time using it on aluminum so I will have to tell you in a couple years how it holds up. Looks like it is on there pretty good. Awlgrip usually wont budge. I re did my outdrive on the 25 with zince cromate primer and then spray paint from Moeller. The windshields sand very easily. If there is lots of corrosion and pitting then you may want to blast with the contraption Tim posted.
strick