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I'm new here and have been reading up all I can on aluminum repairs.  I looked up the amazing goop you want to use, and found this technical sheet:  https://www.austinkayak.com/assets/pdf/Marine_GOOP_Technical_Data_Sheet.pdf

You will want to find out how the flex seal product might interact with the goop, acetone, and other primer/paint used.

I think you will want to identify where the leaks are coming from first.  You might have several loose rivets that can be tightened/tweaked/replaced before you start with all of the other sealants. 

I have not used this product, but it is mentioned in other postings:  https://www.marinetex.com/gluvit.html

Please keep us informed on your project.