CJ737- Thanks for the response and the incite regarding the nightmare this will be. I think I might just pass on this one, seems like more of a big hassle.

A buddy of mine wants me to repair some cracks and holes on the hull of his Aluminum boat. How can I determine what type of Marine Grade Aluminum Alloy it is? I found this list and wasn't sure which one it is? https://metalboatkits.com/guide-marine-grade-aluminum/